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Weather of 2022 in New York

 2022
JANUARY

1 (Saturday) - It was a rainy and mild start to the new year, with a high/low of 56°/50°, and 0.79" of rain (most of which fell after dark).   This was the first low of 50° or milder on 1/1 since 1979, and just the third time overall with a low in the 50s on this date.  The high of 56° was the tenth warmest reading (tied with 2007).  After a record dry November and December, today was the rainiest day since late in October.

7 (Friday) - A fast-moving winter storm produced 5.8" of snow, most of it falling before sunrise.  This was the winter's  first snowfall of one-inch or more, coming about two weeks later than the average date of this occurrence.  Curiously, although Central Park and LaGuardia Airport (which are just seven miles apart) had similar amounts of liquid precipitation (0.38" and 0.33", respectively), CPK's accumulation of snow was 3.9" less than LGA's (9.7"). 

With today’s snowfall, the month’s precipitation for the first week of January reached 1.44”, which was.05” more than what fell in all of December.

8 (Saturday) - With a high/low of 30°/20°, today had the winter's first high of 32° or colder.  This was three weeks later than the typical date, and was the latest date for this occurrence since the winter of 1986-87, when it happened on 1/20.  This "first of the winter" milestone happened the same week as the first low in the teens (1/4), and the first snowfall of an inch or more (1/7).

15 (Saturday) - With a high/low of 21°/10,° today was the coldest day of the winter.  The day's low was the coldest reading in Central Park in nearly three years, since a low of 2° on Jan. 31, 2019.  (10° is on par with the average coldest temperature of winters going back to 1990.)  At sunrise, wind chills were in the 0° to -5° range.  Tomorrow's low would also be 10° (but with a high that was 16 degrees warmer than today's).

17 (Monday) - 1.53" of precipitation fell during a winter storm that moved in yesterday evening, beginning as snow for a few hours (accumulating 0.8"), and then continuing as rain until mid-morning today (when 1.16" fell).  The storm's total was  was more than what fell in either November (1.12") or December (1.39").  Furthermore, this amount of precipitation doubled what had fallen in the first 15 days of January, and at 3.07" in total, was more than what fell in November and December combined.

29 (Saturday) - Snow that began after 8 PM last night continued thru mid-afternoon, accumulating 8.3".  The 7.3" that fell today was a record for the date and was the first snowfall of an inch or more on 1/29 since 1973.  Visibility was less than 1/2 mile for much of the morning.  The temperature dropped sharply overnight from upper 20s to mid-teens after daybreak; winds that gusted between 25-35 mph produced wind chills of 0° to 5° above zero.  This snowstorm had the coldest temperatures since the snowstorm of Jan. 21, 2014 , when 11.5" piled up and temperatures dropped to the low teens in the final hours of the storm.  Today was the 4th consecutive day with a high of 32° or colder, the longest streak in Central Park since the winter of 2018, when there was a 14-day streak (Dec. 26-Jan. 8).

The City was spared much worse conditions as it was on the western edge of an intense nor'easter that brought blizzard conditions  and 15"-30" of snow to Long Island and southeastern New England.

 

FEBRUARY

5 (Saturday) - The temperature at daybreak was 21°, which was a drop of 36 degrees from yesterday's high reading of 57° which occurred in the morning.  The last time the City experienced a drop this great in such a short period of time (25 hours) was in April 2018, when the mercury fell from 77° during the afternoon of 4/14, to 38° at daybreak on 4/15. 

13 (Sunday) - 1.6" of snow fell the day after the high reached 59°.  And although it was quite a turnaround, it pales in comparison to Feb. 9, 2017, when a 9.4" snowfall followed a high of 62° the day before.  And on Feb. 3, 2014, 8.0" fell the day after a high of 56°.  This was the second year in a row in which snow fell on Super Bowl Sunday.  4.5" fell last year, which was the most to fall on the NFL's big day (the game was played on 2/7); this year's amount was the second biggest accumulation.

17 (Thursday) - Today had the year’s first reading in the 60s.  At 68° it was the warmest reading in three months (since 11/18), and a record for the date.  The last time a reading this mild happened in February was in 2018, when the mercury soared to 78° on 2/21 (the warmest temperature ever reported in February).  Today’s spring-like reading, 25 degrees above average, came just two days after a low of 16°.  (There was also a low of 16° on 2/14,  two days after a high of 59°.)

23 (Wednesday) - For the second time in past six days the high reached 68°; however, unlike 2/17’s high, today’s was not a record.  Then after dark, a cold front moved through, and the temperature dropped to the mid-30s by midnight (however, there was no precipitation).  This was the third day this month with a diurnal variation of 30 degrees or more - just the second February with three or more such days (February 1918 had four). 

 

MARCH

7 (Monday) - The temperature rose into the 70s, topping out at 74°, tying the record for the date.  This followed another record tying high yesterday (68°), and was the first reading in the 70s this year, about two weeks ahead of schedule (by contrast, the first day in the 60s, on 2/17, was two weeks behind schedule).  The temperature was still at 71° at 10 PM, when a cold front blew through with winds that gusted to 49 mph in Central Park.  Today's reading was the fourth high of 68+ in the past three weeks, joining 2/17, 2/23, and 3/6 (which all had highs of 68°).   

9 (Wednesday) - It was a sloppy day with wet snow occasionally mixed with rain and temperatures that hovered between 33° and 35°.  The 0.56" of liquid that fell (between 8:30 AM and 6 PM) produced just 0.4" of snow - but this was more snow than what fell in March 2020 or 2021 (both saw only a trace). 

22 (Tuesday) - On average, relative humidity in March between 2PM and 9PM is in the 55%-60% range, but today it was between 11% and 13%.  Only four other dates in the 21st century have had lower readings: 6% on March 30, 2007; 7% on April 6, 2021; 9% on April 20, 2016; and 10% on April 20, 2006.   Skies were sunny and temperatures above average for the ninth day in a row (high/low of 58°/43°).  This was the fifth day in the past four weeks to  have an hour or more with humidity at 25% or lower. 

28 (Monday) - An Arctic front moved through last night, and today's high/low of  33°/23° would have been cold even in the depths of winter.  Although the day's low was far from the record for the date (13°), the high broke the record from 1893 for coldest daily maximum.  This was the coldest high temperature this late in March/early April in 40 years, since April 7, 1982, when the high/low was 30°/21°.  Today had the coldest mean temperature of the month as well as the past six weeks (0.5 degree colder than 3/13, which had a high/low of 35°/22°, and 2/20, which had a  high/low of 36°/21°).

Making the cold even more biting was the wind, which gusted between 20-30 mph.  Finally, the air was quite dry, with afternoon humidity falling to 20%; dew points were in the -5° to +5° range throughout the day.

 

APRIL

7 (Thursday) - Rain moved in at around noon and continued for the rest of the day.  1.12" was measured , with a large portion of it (0.40") falling between 11 PM-midnight (an additional 0.04" fell on 4/8).  Meanwhile, suburbs in northern NJ, the Hudson River valley, and western Connecticut reported between two and four inches.  Besides the rain, it was also windy, with gusts between 20-30 mph.  This inclement weather forced the Yankees to postpone their home opener - the fifth home opener postponed since 2003.

8 (Friday) - The day after rain postponed the Yankees' home opener, today's rescheduled game was played under sunny skies and temperatures in the 60s.  Additionally, the air was quite dry, with the relative humidity dropping to 23% in mid-afternoon.  (Perhaps best of all, the Yankees beat their arch-rivals, the Red Sox, in extra innings.)    

15 (Friday) - Conditions for the Mets home opener were a near replica of last week's Yankees first game as skies were sunny and the day's high reached 70°.  And the visiting team, the Arizona Diamondbacks, probably felt at home because of the very low humidity, which dropped to 13% when the first pitch was thrown.  But the hospitality ended there as the Mets easily won the game, 1o-3.   Today was the fourth day in a row with readings in the 70s - the first time for a streak of this length since late September.

16 (Saturday) - Today, with a high of 73°, was the fifth day in a row with a high of 70°+.  The average high during this streak was 73°, 12 degrees above average.  The last time there was a streak of this length in April was eleven years ago (but it occurred 12 days later than this year's streak). 

17 (Sunday) -With a high/low of 51°/41°, this was the chilliest Easter Sunday since 2009 (49°/36°).  This followed five consecutive days with highs in the 70s.  And similar to last Easter, the air was quite dry, with the humidity bottoming out at 25% in mid-afternoon. 

19 (Tuesday) - A fast-moving nor'easter that moved in late last night was over by daybreak today.  2.09" of rain poured down, mostly between 10 PM and 3 AM.  Winds gusted to 37 mph at Central Park, with 45-65 mph gusts common on Long Island and in Connecticut.  This was the biggest rain total from a storm system since a nor'easter dumped 3.53" of rain nearly six months ago (on 10/25-26 ).   

28 (Thursday) - For the second time this spring the humidity in the middle of the afternoon dropped to 11% (the other day was 3/22; 4/15 had humidity of 13%).  The day also featured clear skies, gusty winds (25-35 mph), and temperatures that were ten degrees below average (high/low of 58°/40°). 

 

MAY

9 (Monday) - It was a day with very low humidity, which bottomed out at 13% at 1o PM -  the lowest humidity reported for this time of day in the years since 2000 (daily humidity is usually lowest mid-afternoon).  Additionally, this was the seventh day this year with humidity falling to 15% or below, which is the greatest number of days going back to 2000 (breaking a tie with 2021).  Furthermore, this was the lowest humidity reported in May.  Finally, humidity of 15% between midnight and 2 AM on 5/10 was the lowest humidity reported so early in the day. 

21 (Saturday) - The temperature reached the 80s for the first time this year, the latest date for this occurrence since 1988.  This was the tenth latest date for this occurrence on record.  And with a high of 90°, this was just the fourth year to have the first 80 and first 90 occur on the same day (joining 1918, 1927 and 2010).  This was the first time a reading was in the 90s in May since 2018.   Besides the heat, the air was oppressive, with afternoon dew points in the 68-70° range.  The morning low of 62° was the coolest on a day with a high in the 90s since 2010, when there was a low of low of 56° on 4/7 (the earliest date on record for a reading in the 90s).

22 (Sunday) - The day after the year's first high in the 90s, today had the first low in the 70s.  Today missed by one degree becoming the first May weekend since 1987 with both days having highs of 90+ (only five May weekends have had this happen; 1987’s is the hottest of them, with highs/lows on May 30 and 31 of 97°/74° and 94°/76°). 

This weekend's unseasonably warm temperatures were similar to the same weekend last May, with this year’s highs/lows being 90°/62° and 89°/72°, while last year’s (on May 22 and 23) were 89°/65° and 88°/68°.

28 (Saturday) - An isolated, severe thunderstorm struck Central Park early in the afternoon, dumping 0.64” of rain in less than an hour (and there was a wind gust of 42 mph).  By contrast, Newark, LGA and JFK had minimal rainfall (and my Greenwich Village neighborhood didn’t get hit as hard as CPK).  Combined with rain early in the morning, the day’s total rainfall of 0.72” set a record as the rainiest Saturday of any Memorial Day holiday weekend.  (Pushing ahead of the 0.68” that fell in 1982, and 0.65” in 2020).  

31 (Tuesday) - Mostly sunny and hot, with a high of 93°.  This was the hottest reading in May since 2000, when the high was 93° on 5/7.  (But it should be noted that there was a high of 96° in April 2002).  This was the second 90-degree reading this month, and although it was three degrees hotter than the high on 5/21, today may have felt slightly more comfortable as the dew point was 8-10 degrees lower than what it was during the afternoon of 5/21.

 

JUNE

15 (Wednesday) - Today, with a high of 83°, was the third day in a row with a high of 80°+ in Central Park - the first time this year, and the deepest into a year since 2003.  Typically, this occurs around May 21-23.  (The first reading of 80°+ this year, on 5/21, was the latest since 1988).

18 (Saturday) - After yesterday's sultry conditions (bright sunshine and a high of 88°), today felt like October as skies were overcast and afternoon temperatures were only in the mid-60s; adding to the chill were gusty winds clocked between 30-40 mph.  (Despite this change, it appeared half of the City's residents hadn't heard the day's forecast as they were walking about dressed as if they expected a repeat of yesterday's summer-like conditions.)   

19 (Sunday) - It was a beautiful Father’s Day despite it being ten degrees chillier than average (high/low of 73°/54°), along with a stiff breeze that persisted throughout the day (but not as windy as yesterday.  This was the first Father’s Day since 2012 not to have a high of 80° or warmer (the average between 2013 and 2021 was 85°).  And the last time the low temperature was this chilly on Father’s Day was in 1958.  Furthermore, humidity late in the afternoon dropped to 25%, which was comparable to the humidity level on Father's Day in 2018 (24%).   

21 (Tuesday) - It was an overcast, cool, and somewhat damp day (some sprinkles, mist, and fog from mid-afternoon onward).  Temperatures were stuck in the 60s, with a high/low of 67°/62; the high was 15 degrees cooler than average, but the low was just 5 degrees under.  This was the only day this month with a high in the 60s, and the first since another high of 67° occurred on 5/24.  

 

JULY

3 (Sunday) - For the third day in a row the low temperature was 73°.  The highs on these three days, however, were all different: 91°-87°-88° (today).

4 (Monday) - Under fair skies, the day's high/low was 85°/65°.  During the early afternoon the humidity dropped to 22%, which was the lowest reported in July since 2010, when it was 19% at 4 PM, also on 7/4.  This afternoon's low humidity made the temperature feel like 82°.

6 (Wednesday) - Today's high was 85°, the seventh consecutive day with highs of 85° or warmer.  The last time there was a streak this long was in June 2020 (6/20-26).  The average high/low during the streak was 87°/71° (2020's was 87°/72°).

 

 

 

 


December 2021 Weather Recap: Mild & Dry

 December 2021 recap

 
December 2021 was the third mildest on record (behind 2015 and 2001, and 0.1 degree ahead of 1984), and tied for fourteenth driest.  At 4.7 degrees above average, it was the most above average month of 2021 (passing October, which was 4.1 above average).  Although it ranked third for mean temperature (average of high/low), the month had the second mildest average low, and was tied for seventh mildest average high.

 

Seven days had mean temperatures that were 10+ degrees above average, and eight days had highs of 55° or milder (half of these days were in the 60s).  The mildest reading was 66° on 12/11, which was a record for the date.  Two extended periods of mild temperatures were largely responsible for the month being so mild, as Dec. 11-18 was 11 degrees above average (high/low of 56°/44°), and the last week of December was 8 degrees milder than average (48°/40°).  This was just the seventh December to have no temperatures of 32° or colder in the last seven days of the month. 

 

Six days had lows of 32° or colder (average number for December is 14), with the coldest reading being 25° on 12/20.  Only three other Decembers have had a milder reading as their coldest reading:  2015 (34°); 2012 (28°); and 1974 (26°).  And Dec. 1984's coldest reading was also 25°.  (On average, the coldest reading in December is in the upper teens; before 1970 it was in the low teens). 

 

Like November, December was quite dry, with just 1.39" of precipitation  measured.  Combined, these two months became Central Park's driest Nov.-Dec. on record.  Ironically, this dry combo occurred in one of the ten wettest years on record.  By contrast, the nine driest November-Decembers behind 2021 had about twenty inches less annual precipitation than 2021.

 

Chart - Driest NovDec 

With the exception of the last week in October, which had 4.71" of rainfall (the wettest last week of October on record), the other 12 weeks between Oct. 1 and Dec. 31 had only 3.06". 

 

December had just 0.2" of snow, which occurred in the pre-dawn hours of 12/24.  However, meager snowfall in December isn't uncommon, as smaller amounts (or none at all) have occurred in five Decembers  since 2001, and nine since 1994 (once every three years).

 

Unusually low humidity was reported on two dates - 20% on 12/14, and 14% on 12/17 (both in the afternoon).  Going back to the early 1940s, 14% is the lowest humidity ever reported in December (the previous low was 16% on Dec. 8, 1981).  Humidity levels below 25% are very rare in December (most instances of low humidity occur in March and April).

 

Finally, the month, and year, ended on a mild note as the temperature at the stroke of midnight was 51° (after a high of 55°).  This was the mildest reading during the ball drop at Times Square since 2004 (and the fifth mildest ball-drop reading on record).

 

Chart - 10 Mildest Decembers 

Other December recaps:

2020

2019

2018

2017

2016

2015

 

 Windowsill xmas


November 2021 Weather Recap: Dry & Chilly

 Nov 2021 calendar

With just 1.12" of rain, November 2021 was the driest November since 1976 (the driest November on record).  The month was also 1.8 degrees chillier than average, making it the most below average month of the year (February and July were  1.7  and 1.5 degrees below average, respectively).  This November was significantly chillier than last November (the mildest on record), as it was 6.8 degrees colder - the biggest temperature drop from the previous November since Nov. 2012.  Only eight other Novembers have had a bigger drop in average temperature compared to the November immediately preceding it.

 

Chart - nov v nov

 

Despite its big difference from last November, Nov. 2021 was far from the ranks of the coldest, as it tied for 80th chilliest.  (Fun Fact: Every November between 1869-1894 was colder than Nov. 2021.)  Still, it had 14 days that were five or more degrees below average.

The month's warmest reading was 69° on 11/18, followed six days later by the coldest reading (30°).  Although this was the latest date for a temperature this mild in six years, it was the first time since 2014 that the warmest November reading failed to be in the 70s.  Of note is that this warmest reading didn't occur during the 6-day period Nov. 8-13, which was six degrees milder than average.

In October, the first low in the 40s wasn't until 10/18, which was the second latest date on record.  In November, however, the fall's first reading of 32° or colder (32° on 11/23) was close to the average date of this occurrence. 

Most of the month's 1.12" of rain fell during two rain events on consecutive days:  0.48" on 11/12, and 0.33" on 11/13.  On the 13th, an uncharacteristic precipitation type for November, hail, fell for a few minutes during a quick-moving thunderstorm.  Another type of frozen precipitation, snow flurries, was reported on the last three days of the month  - but there was no accumulation in Central Park (Newark Airport reported 0.1" on the 28th).

Here are recaps of previous Novembers:

2020

2019

2018

2017

2016

2015

 

 

 

 


Days With Temperatures Stuck in the 60s

 

Stuck in the 60s

October 2021 was distinguished by having six days with highs and lows that were both in the 60s - the most such days in one month.  On average, two or three of these days occur each year, and they've occurred between May and November (ranging from 5/11 to 11/21).  September is the month most likely to have such days, and the date most likely to have one has been 9/17 (in nine years).  The year with the most  of these "stuck" days is 1903, with 13 of them (five other years have had between seven and eleven).  19 years have had none of these days, the last time being in 2019.

 

Chart - stuck in 60s by month
 

Nearly 80% of these days have had measurable rain, with 18% receiving more than an inch, and 75% a half inch or more.  The greatest rainfall on one of these days was 3.84" on Sept. 1, 1927.  (The last time three inches or more fell on a day stuck in the 60s was on Oct. 27, 2017.)  Despite the high likelihood of rain, only two of the last 15 days with temperatures stuck in the 60s had rain.  

Other observations:

  • Average high/low is 67°/62°, with average rainfall at 0.50". 
  • The most prevalent high/low is 68°/60°.  Nearly 70% of the days had highs of 67°, 68° or 69°, while  nearly 75% of the days had lows of 60°, 61°, or 62.°.
  • The warmest low on one of these days is 67°, which happened twice:  Oct. 1, 1902, and July 20, 1869. The coolest high temperature is 62°, which has occurred four times.
  • One of these days had a one-degree diurnal variation (high/low of 66°/65° on Sept. 17, 1869); 12 others had two-degree variations.

I've also written analyses about days stuck in the 30s and 70s.

 

Chart - years with most days stuck in 60s

 


October 2021 Weather Recap: 6th Mildest October Ends With Soaking Rains

 Oct 23 abingdon square park

 

After unprecedented rainfall in July, August, and September (each month had more than ten inches), it appeared a respite was in store during October, as the first half of the month was the driest since Oct. 2000, with just 0.15" of rain measured.  However, these dry conditions came to an abrupt end in the last week of the month, as 4.71" was measured - the wettest last week of October on record (and eight of the last nine days had measurable rainfall).  Much of the week's rain was produced by a nor'easter on the 25th-26th that dumped 3.69" of rain. 

 Chart - rainiest last week of october

 

The month's other storyline was its mild nighttime temperatures.  There was a record streak of lows in the 60s (13 days), which was also the month's total number of days with lows in the 60s, tying Oct. 1879 for the most on record (the average number of lows of 60+ in October is 4).  Lows during the first 12 days of the streak were in the narrow 60°-62° range; Day 13's low was 63°.  Of the eight longest streaks of lows in the 60s/70s in October, this year's record streak was the coolest.

 

Chart - streaks of 60_deg lows in october

 

Overall, the month was 4.1 degrees above average, and became the sixth mildest October on record (it ranked fourth for average low, and tied for 19th for average high).  17 days were five degrees or more above average; seven days had  below average mean temperatures.  The most above average day was 10/15, which was thirteen degrees warmer than average (high/low of 79°/63°); the most below average day was 10/1 , which was five degrees below average (67°/51°).

 

Temperatures during October ranged from 47° (on 10/19, 10/24, and 10/29) to 79° (on 10/15).  Only three other Octobers have had a smaller temperature range: 1977 (30 degrees); 2004 (31 degrees); and 1894 (31).    This mirrored September, which had a 31-degree variation, and was tied for third smallest variation.

 

In an oddity, there were six days with temperatures stuck in the 60s - the most on record for any month.  They occurred in three pairs, and were concentrated in the nine-day period between Oct. 3-11.  This narrow temperature range was largely due to persistent overcast skies.

 

The season's first low chillier than 50° was reported on 10/18, which was the second latest day for this occurrence (latest is 10/20).  Additionally, the month's chilliest reading of 47° (reported on three days), was the mildest chilliest reading on record for October (on average, the coldest reading in October is in the upper thirties). 

 

Here are previous recaps of October's weather:

2020

2019

2018

2017

2016

October review


September 2021 Weather Recap: A Record-Setting 3rd Month in a Row with 10+ Inches of Rain

 

  Lee goldberg wabc

September 2021 will long be remembered for the torrential rain that fell the night of 9/1, submerging streets, highways, subway tunnels and residences.  Nearly 50 deaths in the metro area were attributed to the storm (13 of them were in NYC).  This unprecedented deluge was produced by the remnants of hurricane Ida pushing up against a mass of cool air.  Between 5 PM and 1 AM, a little more than seven inches of rain poured down (with three inches falling between 9-10 PM). 

 

Although heavy rain had been predicted, its intensity in such a brief period of time took residents by surprise.  (And although hurricane Henri, two weeks earlier, produced an inch more of rain than Ida, it fell over the course of 48 hours). 

 

Never before had a month started with so much rain, easily breaking the previous record amount on the first day of a month, 4.98" on Oct. 1, 1913.  The 7.13" measured on 9/1 was the fifth greatest amount to fall on a calendar date.  (Earlier this year, February began with a record amount of snow for the first day of any month, 14.8".)

 

Ida flooding nyc
 

The rest of the month had slightly below average rainfall, but just enough to bring September's total to 10.03".  This was the most rain to fall in September since 2004, and it became the sixth rainiest September on record.  It followed the fourth wettest August (10.32"), and third wettest July (11.09").  Never before had Central Park had three months in a row in which each month had more than ten inches of rain. 

 

More than 90% of the month’s of rain was produced by two storms:  7.23” on 9/1-2 and 2.03” on 9/23-24.  0.77” fell on the other 26 days.

 

Looking at temperatures, September was 1.1 degrees milder than average, and was the 26th mildest September (tied with four other years).  However, it ranked 13th for mildest average low, and 55th for warmest high.  12 days in a row (Sept. 12-23) had above average temperatures, a streak of days that was four degrees above average.  The rest of the month was one degree cooler than average.

 

The warmest reading was 85° (on 9/15), the same warmest reading as last September (but it had two days with that high).  Also, both Septembers had seven days with highs in the 80s (the average is eleven).

 

Half of the days in September had highs between 75°-79°, which was double the average number - and the most to be in this narrow temperature range on record (second most is 13 days in Sept. 1999, 1927 and 1908).  Just five days had lows cooler than 60°, eight fewer than average.  Only Sept. 1971, 1930, 1908, and 1881 had fewer days (all had four). 

 

Finally, the month was also characterized by a narrow range in its temperature extremes.  Typically, September's chilliest reading is around 50°, the hottest around 90°, but this September it ranged from 54° (on 9/29) to 85° (on 9/15).  Only two other Septembers have had a range that was smaller.  (The greatest range in temperatures in September was 55 degrees in 1929, ranging from 44° to 99°.) 

 

Chart - narrow range of sept temperatures

 

Here are previous September recaps:

2020

2019

2018

2017

2016

2015

2014

 

 

 


August 2021 Weather Recap: Henri Rescues August From "Dullsville"

 

 Hurricane henri aug 2021

 

August was the fourth wettest August on record, but until 8/21 the month had been a dry one, with rainfall 50% below average.  Then, Hurricane Henri produced 8.19" of rain over three days (Aug. 21-23), accounting for nearly 80% of August's 10.32" of rain.  (The other 28 days of the month had just 2.13".)  This was the second month in a row with more than ten inches of rain (July had 11.09", making it the third wettest July),  just the second time this has happened (however, the first time, in March and April 1983, is disputed since the rain gauge in Central Park wasn't functioning properly for much of the year).  Although August's rainfall was less than an inch below that of July, its number of days of measurable precipitation was half as many (nine vs. eighteen).

 

Chart - rainiest back to back months
 

One out of four Augusts have been warmer than July, and August 2021 was one of them (77.5° vs. 76.0°).  The month was 1.4 degrees above average, making it the City's 17th hottest August (out of 153).  However, there was a disparity in rankings of the average high and low, as only five other Augusts have had a warmer average low than this August (2.2 degrees warmer than average), but the average high (just 0.6 above average) was ranked much lower, at #39.  This difference in rankings wasn't unique to this August, as the trend during the 2000s has been for overnight temperatures to be more above average than daytime readings (one of the effects of global warming).

 

After the first five days of the month were five degrees below average, the rest of the month was three above average (with only five of the 26 days having cooler than average mean temperatures).  August had five readings in the 90s, one more than July, and it had five more days than July with lows of 75° or warmer.  August's days in the 90s were comprised of back-to-back days on Aug. 12-13, and a three-day heat wave two days after Henri's departure (Aug. 25-27).  The month's hottest reading was 94° on 8/13.

 

Finally, this was the eighth year in a row in which August had no readings in the 50s.  The coolest temperature was 63° on 8/2.  (Meanwhile, July's streak of 12 years with no lows cooler than 60° was broken this year). 

Henri

Here are monthly recaps for past Augusts:

2020

2019

2018

2017

2016

2015

 

 

 

 

 

 

   


July 2021 - Third Rainiest July Keeps Mid-Summer Heat in Check

 Noahs ark in water

With 11.09" of rain measured in Central Park, July 2021 became the third rainiest July on record (behind 1889 and 1975), and 15th wettest month overall.  This was New York's first month with ten inches or more of precipitation since June 2013 (10.10"), and the most to fall in any month since August 2011, when 18.95" flooded the City (the greatest monthly amount on record). 

 

A little more than half of July's rain fell on three days between July 8-12: 2.27" on 7/8; 2.06" on 7/9, and 1.42" on 7/12.  The amounts of 7/8 and 7/9 set records for the dates.  8.49" of rain fell in the first 12 days of the month (and 9.14" if 6/30 is included), then 2.60" fell thereafter (which was slightly below average for that period). 

 

There were 18 days of measurable rain, which was the second greatest number of days with rain in July.  July 1871 had twenty days, but just half the amount of rain as July 2021.   (Of the 27 months with ten inches or more or precipitation, the average number of days of measurable precipitation is 13.) 

 

Besides being rainy, this was the coolest July since 2009 (and 0.1 degree cooler than July 2014).  When all Julys are considered, July 2021 is in the middle of the pack, temperature-wise, with 54% being warmer.  The combination of a warmer than average June (+2.3 degrees), and July being 1.5 degrees cooler than average, placed these two months closer together (1.7 degrees) than any June/July combo since the summer of 2001 (when July was just 0.3 degree warmer).  Looking at average high and low, July's average high of 83.0 was just 0.5 degree warmer than June's, while the low of 69.0 was 3.0 degrees milder.  Because many days had dew points in the 68°-73° range, the air often felt oppressive rather than cool.

 

So close_colbert
 Chart - july close to june

 

For the first time since 2009, a reading in the 50s occurred in July - 59° on 7/3.  And on 7/3, the high was only 66°, which was the first high cooler than 70°in July since 2013, and the coolest reading in July since 2005 . The month's coolest and hottest readings were three days apart as a high of 92° occurred on 7/6 (and the 59° reading came three days after June's hottest temperature, 98°, on 6/30).

 

July had four days in the 90s, half as many as June, and the fewest such days in July since 2014, which had three.  (Seven of the Julys between 2000-2009 also had four or fewer days in the 90s.)  Although the number of days of 90+ was half the average for July, the number of lows in the 70s, 16, was an average am0unt (but ten fewer than last year's record amount).

 

July had 8.47" more rain than June's 2.62", but there have been ten other instances where the disparity between two months was even greater (looking only at wet months preceded by dry ones).  The greatest difference occurred in  Sept-Oct 2005, when October had 16.73", which was 16.25" more than September's bone-dry 0.48".

 

Chart - greatest dif in precip btwn 2 mos

Finally, after suffering through sweltering heat, and a nighttime thunderstorm on the last day of June, the last day of July couldn't have been more different, as skies were clear and temperatures on the cool side (high/low of 77°/60°).  While 6/30's high of 98° (14 degrees above average) was the hottest reading on that date since 1964, 7/31's low of 60° (ten degrees below average) was the chilliest since 1956.

 

July 2021
 

Here are other July recaps:

July 2020

July 2019

July 2018

July 2017

July 2016

July 2015

July 2014

 

 

 

 

 


June Weather Recap: Two 4-Day Heat Waves Make June 2021 One of NYC's 10 Hottest

 City sunflower 2021

With a scorching high of 98° on the last day of the month (along with a heat index of 106°), June 2021 became New York's ninth hottest June.  This was Central Park's hottest temperature since 2013, and the hottest reading in June since another 98° high in June 1994.  6/30 was also the last day of the month's second four-day heat wave, which was just the second time there were two heat waves of this length (or longer) in June (the other was in June 1943, the hottest June on record). 

 

The month's eight days with 90+ highs were the most in June since June 1991 (which had nine).  Only four Junes have had more hot days: 1943 (11), 1966 (10), 1925 (9) and 1991 (which was slightly cooler than June 2021, ranking as 14th warmest).

 

The month had nine days with lows in the 70s, tying it for ninth most in June.  The month's five days with lows of 75° or warmer was the most since there were six in June 1943.  (June 1909 had the same number as this June.)  Finally, in the years since 1940, the low of 76° on 6/6 was the fifth earliest date for a low this warm.

 

Ironically, despite the month's warmth, this June had the latest occurrence of a reading in the mid-50s since 1995, occurring on 6/23 (54°).  This was the coolest reading of the month (twelve degrees below average).

 

The month's two four-day heat waves were three weeks apart - June 6-9, and June 27-30.  The first heat wave averaged a high/low of 91°/74° (13 degrees above average), the second was 94°/75° (nine above average).  Both heat waves had a day with significant rainfall at night, 0.47" on 6/8, and 0.65" on 6/30.  Without these heat waves, the other days of the month were one degree cooler than average.

 

Besides the high of 98°, the last day of June was also the rainiest day of the month (0.65").  If it hadn't been for this rainfall, this would have been the second June in a row with less than two inches of rain, something that hadn't happened since 1978 and 1979.  These nighttime thundershowers cooled the temperature to 73°, erasing the day's morning low of 80°.  (If that sultry low had remained the day's low, this would have been the seventh, rather than ninth, hottest June.) 

 

With eight days of 90+ readings by 6/30, 2021 joined 20 other years (since 1869) to have this many by that date (1991 had the most - 15).  The last time there was this many by this date was in 1994.  Prior to that, between 1923-1994, this many days in the 90s by the end of June occurred much more regularly, once every four years.

 

Finally, in an interesting contrast, while the last four days of June had highs in the 90s (eleven degrees above average), the last four days of May all had lows in the 40s (ten degrees below average).

 

Girl_cooling_off_in_fountain_ethiogrio

Here are previous June recaps:

2020

2019

2018

2017

2016


May 2021 Weather Recap: Close to Average Temperature & Rainfall Despite Very Chilly & Wet End

 Wet and chilly memorial day weekend

 

Last May, the month's weather highlight was an Arctic outbreak in the second week of the month that produced the coldest reading in May (34°) since 1891.  May 2021, meanwhile, experienced one of the chilliest ends of any May, as May 28-31 tied May 1884 for the latest four-day streak with lows in the 40s.  This chilly ending was responsible for the coolest three-day Memorial Day weekend on record. 

 

Chart - 3 chilliest memorial day weekends

Despite the month's chilly ending, an extended period of above-average temperatures from May 15-27,  that was six degrees milder than average, kept the month close to average, temperature-wise.  And a very wet May 28-30, in which 2.57" was measured, balanced what, up until then, had been a dry May (these three wet days had as much rain as the previous six weeks).  So, when all was said and done, the month was very close to average on both the temperature and rainfall fronts (-0.3 degrees, and +0.40").

 

Before May's chilly and rainy close, six days in the 10-day period between May 18-27 had highs in the 80s.  This included highs of 89° and 88° during the weekend of 5/22 and 5/23; by contrast, the following weekend had highs of 51° on both days.  This reading (which was eight degrees colder than the average low for these two dates) tied a record for the coolest high on 5/29, and set a new record (by four degrees) on 5/30.

 

Besides the last four days of the month, which were 13 degrees cooler than average, there was an eight-day period from May 5-12 that was five degrees below average.  (However, the chilliest reading of the month, 42°, was on 5/1.)

 

Finally, the last six days of the month all had measurable precipitation, the longest rainy streak since one of eight days in May 2019 (5/10-17).  However, this year's streak had a touch more rainfall (2.68" vs. 2.56").

 

Here are recaps of the previous six Mays:

2020

2019

2018

2017

2016

2015

 

May 2001