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January 2024 Weather Recap: A One-Week Taste of Winter

 

One out of four

 

Historically, there has often been a period in late January referred to as the "January Thaw", when a brief respite from winter's cold took place.  This year, however, New York experienced the reverse, as there was a "January Freeze" between January 15 and 21.   The average high/low during this freeze was 30°/21°, with six of the seven days having a high of 32° or colder.  

 

This period was seven degrees below average; meanwhile, the rest of the month was seven degrees above average.  This produced a temperature for the entirety of the month that was 3.3 degrees above average, making January 2024 the 25th mildest January on record.  While the month's average high was 2.5 degrees above average, the average low was 4.0 degrees above average (ranked by average low, January 2024 was 17th mildest).

 

During the January freeze, Central Park had the winter's first day with a high of 32° or colder, the second latest date for this occurrence (behind the winter of 1987). 

 

Although it was on the mild side, this January was 6.5 degrees colder than last January (which was the mildest on record).  

 

With 5.28" of precipitation, January 2024 was the wettest January of the century (and 21st among all Januarys).  Two-thirds of its rain was from three storm systems: 1.95" on 1/9-10; 0.89" on 1/12-13, and 0.87" on 1/28-29.  The rainfall on 1/9 was a record amount for the date. 

 

Adding January's precipitation to that of December's 6.71" made this the wettest Dec/Jan combo since 1978-79, and the seventh wettest Dec/Jan on record (with an amount that was 50% above average).  

 

Clipart - Most Dec-Jan Rain

(Note: If the chart above excluded precipitation that was snow, Dec/Jan of 2023-24's rank would rise to fifth, passing 1948-49 and 1977-78 (which had 27.1" and 20.7" of snow, respectively, while 2023/24 had just 2.3".

 

January's mildest reading was 60° (on 1/13), coldest was 17° (on 1/17).  The Arctic high that delivered this frigid cold to the Rockies, Plains, Midwest, Great Lakes, and the South, gave New York just a glancing blow.  Nine days had readings of ten degrees or more above average, two were ten or more below average.

 

The biggest snowfall was 1.7" on Jan. 15-16.   The 0.2" of snow that fell on 1/6 was the first measurable snow this winter and one of the latest dates for the first such snowfall.  In total, 2.3" of snow fell in January, which was the amount of snow that fell during the entirety of last winter.

 

Finally, the last nine days of the month were all overcast.

 

Here are recaps of weather in January from previous years:

2023

2022

2021

2020

2019

2018

2017

2015

2014

 

 

 


December 2023 Weather Recap: 2023 Ends with New York's 2nd Mildest & 9th Wettest December

 

Dec 12 - xmas bells2

 

December 2023 became New York's second mildest December on record and its ninth wettest.  But despite it being such a mild month (5.5 degrees above average), the warmest temperature of the month was just 62° (on 12/18), which is typical for December’s mildest reading.  However, the month’s coldest reading, 25° on 12/22, was seven degrees milder than the typical coldest reading.

 

Chart - 5 mildest december (as of 2023)

 

December had 6.71” of rain, making it the fourth month of 2023 with 6.50” of rain or more, something that’s happened in just five other years (2018, 2007, 1989, 1983 and 1901). 

 

Chart - 2023 wettest months

 

After the coldest reading of the month on 12/22, 25°, the rest of the month had no readings of 32° or colder.  The average low between 12/23-12/31 was 42°, eleven degrees above average.

 

There were ten days with a mean temperature 10 degrees or more above average.  The most above average day was 12/28 which was 16 degrees above average (high/low of 55°/49°).   Only six days were colder than average.  The chilliest day was 12/22, with a high/low of 37°/25° (six degrees below average).

 

Three rainstorms produced more than 1.50” of rain.  They accounted for 5.68” of the month’s 6.71” of rain.

  • 1.67" fell on Dec. 10-11
  • 2.47" fell on Dec. 17-18 (2.21" on 12/18 set a record for the date)
  • 1.54" fell on Dec. 27-28

 

Like last year, November and December of this year had only a trace of snow in Central Park, joining the winters of 1971-2 and 1972-73 as the only back-to-back winters with no measurable snow in Nov/Dec.

 

March and December had the same average temperature, but December’s was 5.5 degrees above average while March’s was 1.8 degrees above average.  And while December 2023 was the second mildest on record, March was the 25th mildest.  Finally, December had twice as much rain as March.

 

Chart - dec and mar 2023

 

Here are recaps of previous Decembers:

2022

2021

2020

2019

2018

2017

2016

2015


November 2023 Weather Recap

 

November 2023

November 2023 was 1.3 degrees chillier than average.  And while its average high was just 0.7 degree below average, the low was 2.0 degrees colder than average.

 

Almost all of the month's interesting aspects (i.e., biggest rain event, mildest and coldest temperature) occurred in the last ten days of the month.

 

Most of November’s 2.95” of rain (somewhat below average) fell during 11/21-22 when 2.52” poured down (much of it on the 22nd, which was the day before Thanksgiving).  This was the biggest November rainstorm in seven years.  It soaked the area after just 0.07” was measured in the first 20 days of the month.  This November’s total rainfall was close to last November, which had 3.15”.

 

Chart - Lengthy  Dry Starts to November

 

The fall’s first low of 32° or colder occurred on 11/25, which was four days later than the average date for this occurrence.

 

The month’s coldest reading was 27° (on 11/29), which was also Nov. 2022’s coldest reading.  However, this November’s mildest reading of 67° was ten degrees cooler than last November.

 

Finally, temperatures on the Sunday of the NYC Marathon (11/6) and on Thanksgiving Day (11/23) were very similar, with highs and lows of 56°/44° and 52°/44°, respectively.  And neither day had any rain. 

 

Here are recaps of NYC's previous eight Novembers:

2022

2021

2020

2019

2018

2017

2016

2015

 


October 2023 Weather Recap: Warm Beginning & End

 Autumn in new york

October 2023 was was 2.6 degrees warmer than average.  It was the fourth mildest October in the years since 2000 and the 20th mildest since records began in 1869.  The first week of the month was seven degrees above average; Oct. 27-30 was 14 degrees above average.  These 11 days were 10 degrees above average; the rest of the month was one degree below average. 

 

Three days had highs in the 80s: 10/3, 10/4, and 10/28.  The warmest reading of 83° on 10/4 was the warmest reading in October since 2019.  And the high of 80° on 10/28 was Central Park's latest reading in the 80s since 1993 when it occurred on 11/15.  (Average date of the last high of 80+ is 9/28.)

 

After 14.25" fell in September (the fourth rainiest month on record), October dried out and had about ten inches less.  Although the 3.90" that was measured was slightly below average this was the driest October since 2018.  Much of of the month's rain came from three storms between 10/14 and 10/30: 0.81" on 10/14;  1.51" on 10/20-21; and 1.06" on 10/29-30.

 

In addition to October 2023, October 1936 also had 3.90" of rain.  And five other Octobers had very similar amounts.  In 1987, October had 3.89"; October 2015 had 3.91"; October 1973 had 3.92"; October 1979 had 3.87"; and October 1980 had 3.86".  

 

Chilliest day of the month was on 10/31, with a high/low of 51°/45°.  Only October 2021 had a milder "chilliest" reading in October (47°).

 

Halloween

Here are recaps of previous Octobers:

2022

2021

2020

2019

2018

2017

2016

 

 


September 2023 Weather Recap: 2nd Rainiest September on Record

  Sept 29 2023 rainstorm_map1-abc-ml-230929_1695989164289_hpEmbed_16x9

After a very warm and dry start, September 2023 ended cool and very wet.  The six-day period Sept. 3-8 all had highs of 88° or hotter, with an average high of 91° (eleven degrees above average).  Then the eight-day period Sept. 23-30 all had highs of 66° or cooler, with an average high of 64° (eight degrees below average).  Temperature-wise, the two periods balanced each other out and the month ended up with a close to average temperature (+0.2 degrees above average). 

 

After having no days in the 90s in August, September had four, the most in September since there were six in Sept. 2015.  The four days in the 90s were consecutive, making this the only heat wave of the year.  And with highs of 93°, Sept. 6 and 7 tied July 5 for hottest reading of the year.  (9/6, with a high/low of 93°/77° had the hottest mean temperature of the year.) 

 

Despite there being no measurable rain in the first week of the month, September 2023 ended up being the second rainiest September on record with 14.25" measured  (September 1882 had 16.85") - and the fourth wettest of any month.  More than half of the rain (8.90") fell in the last eight days of the month. (This amount alone would have made it the 10th wettest September.)

 

Chart - 5 rainiest months on record

 

Five days had more than an inch of rain (and another had 0.96"), the most in one month since August 2011 which had six.   The rainstorm of 9/29 produced 5.48" of rain (much of it in a 3-hour period), the ninth greatest amount to fall on a calendar date.  Tropical storm Ophelia impacted NYC's weather for four days (9/22-9/25) and produced 3.00" of rain, close to what fell in just two hours on 9/29.

 Chart - Sept 2023 Daily Rainfalls of 1 Inch or More

The last 16 days of the month all had below average mean temperatures, the longest below average streak since April 2020, which also had a 16-day streak in the month's last 16 days (a streak of 22 days, occurred in March 2018).  Additionally, the last eight days all had highs in the 60s, the longest such streak in September in the years since 1960 (the coolest reading of the month, 50°, was reported on 9/27).  For the entire month there were 10 days with sub-70 highs, which was the most in September since 2006.  

 

In total, there were 12 days with highs in the 90s in 2023, the fewest since 2014, which had eight.  The last time a summer had its hottest reading at 93° or cooler was in 2014 when it was 92°.

 

Of the 23 years in which August had no readings in the 90s, September 2023 had the second most highs in the 90s (Sept. 1915 had the most - five)

 

Here are recaps from nine previous Septembers:

2022

2021

2020

2019

2018

2017

2016

2015

2014


August 2023 Weather Recap: Protective Bubble Keeps Searing Heat Away From NYC

 

Protective bubble

 

Compared to other regions of the US, New York continued to be blessed by relatively mild summertime temperatures.  August was 1.1 degrees cooler than average and was the first August since 1986 not to have any reading in the 90s.  (By contrast, last August was the third hottest on record, with 11 days having highs in the 90s.)  It was the coolest August in six years (and the summer of 2023 was the coolest in six years as well).

 

The month's hottest reading was 88°, which occurred twice (on 8/13 and 8/21).  The last time the warmest temperature in August was 88° (or cooler) was in 1963 (the coolest warmest temperature of any August is 83° in 1927).  The warmest stretch this month was the four days between 8/11-14 with highs of 85°-85°-88°-87° (just slightly warmer than average).

 

Chart - chilliest warmest reading in aug

This was the tenth year in a row in which August’s coolest temperature was 60° or milder (63°).  Only five Augusts have had their coolest reading milder than this August.  However, the ten days with lows of 70° or warmer was below the average of 14 for August.  (This was after July had 24 such lows, third most on record for that month.)

 

Chart - mildest chilliest reading in aug

The most above and below average daily mean temperatures were in a narrow range of just +/- five degrees.  The coolest and warmest temperatures in August were just 25 degrees apart (63° and 88°), which is the narrowest range on record for the month of August (average is 34 degrees, 60° and 94°).  This followed July, which had the third smallest temperature range for that month (66° and 93°).  

 

6.56" of rain fell in Central Park, making this the 29th rainiest August (this was after no measurable rain fell in the first six days of the month).  This was the second greatest amount this year (behind April's 7.70").  Much of the month’s rain (nearly five inches) fell during relatively brief downpours between 1 AM and sunrise on six days.  The biggest deluge was 1.25" that fell between 3:30-5 AM on 8/16.

 

Here are monthly recaps for past Augusts:

2022

2021

2020

2019

2018

2017

2016

2015

 


July 2023 Weather Recap: Consistently Warm Rather Than Excessively Hot

 

 July 30 - purple flower

 

This post may be one of the few weather-related articles that doesn't hyperventilate about hot weather in the middle of summer.  And despite New York's news media hyping the term "heat dome" any time the local forecast called for a high approaching 90°, just five days in July had highs in the 90s in NYC, and there were no heat waves; the hottest reading was just 93°.  Globally, July was the hottest month on record, but that wasn't the case in Central Park as it was the 20th warmest July (average high/low was 86.4°/71.7°, 1.5 degrees above average).  

 

Every day but one had a high of 80° or warmer (the typical number of days in July with highs cooler than 80° is six), comparable to last July which had no such days.  As for low temperatures, this July and July 2022 both reported 24 days with lows in the 70s, tying three other Julys for third most (July 2020 had 26, 2010 had 25).  Although it had a below average number of days in the 90s (five versus seven), July 2023 had an above average concentration of highs that were 88° or 89°, with ten counted.

 

July was slightly wetter than average, with 5.34" measured.  This was almost double what fell in May and June combined (which had 1.29" and 1.62", respectively).  More rain fell in the first four days of July (1.66") than what fell in all of June.  This included 0.63" of rain that fell on 7/4, the most on Independence Day since 1981 (when 1.76" fell).   

 

The month's greatest daily rainfall was 1.32" on 7/16 (0.91" of it fell between 11 AM and 1 PM); this daily total was more than what fell in all of April.  On that day, which had a low of 74°, the high reached just 78°, which is the coolest high temperature ever reported with a low this warm.   

 

Only five days had below average temperatures, all of which occurred in the second half of the month.  Meanwhile, seven days were five or more degrees above average.

 

July's temperature range was only 27 degrees, from 66° to 93°.  This compares to an average range of 34 degrees (62° to 96°).  Only one other July has had a smaller range (2004's 24-degree range).

 

Although there were no heat waves, there was a streak of eight days with highs of 85° or warmer (July 22-29).  Finally, high dew points were a consistent feature of July as two-thirds of the days in July experienced dew points of 70° or warmer, giving the air an uncomfortable, tropical feel. 

 

Here are July recaps from previous years:

July 2022

July 2021

July 2020

July 2019

July 2018

July 2017

July 2016

July 2015

July 2014


June 2023 Weather Recap: Dry, Below Average Temperatures ... and Smoky Conditions

 

Nyc orange haze

 

After a May characterized by consistent sunny skies, June 2023 will likely be remembered for the one day, 6/7, when smoke from Canadian wildfires shrouded the City in an otherworldly orange haze.  This overshadowed the fact that June was the driest since 1999 (with 1.62" measured it became the 19th driest June overall) and was the coolest June since 2009 (two degrees below average).  Besides 6/7 there were other days that experienced low visibility because of the wildfires including the last three days of the month.   Other June highlights included:

 

  • The first two days of June were hot and sunny (with highs of 87° and 91°) but then the rest of the month was 2.6 degrees cooler than average, with only five days having above average temperatures. 
  • Less than 48 hours after a high of 91° on 6/2, the low on 6/4 was 49° - the first reading in the 40s in June since 2000.
  • There were just nine days with highs of 80° or warmer, about half the average number of days (17).  This was the fewest since 1985 which also had nine days (June 1958 had eight).
  • June's first day with a low in the 70s was on 6/25 and came more than two months after the year's first such low on 4/14 (the earliest date for a low this warm).
  • June and May were both cooler than average, the first time back to back months were below average since April and May 2020.  This was also the second month in a row with less than two inches of rainfall (and it was the fourth year in a row in which June had less than three inches of rain).  June 2023's rainfall was nearly three inches below average.
  • 2023 became the 11th year in which three of the years' first six months had less than two inches of rain.

 

Here are June recaps from the previous six years:

2022

2021

2020

2019

2018

2017

2016


May 2023 Weather Recap: Sunny & Dry Conditions Prevail

 

"Blue skies smilin' at me,Nothin' but blue skies do I see"

- Willie Nelson

 

May 2023 in New York brought to mind Willie Nelson's song "Blue Skies" as there was an overabundance of sunny or clear skies.  After the month began damp, chilly, and overcast (thru 5/5), 24 of the next 26 days saw either sunny or clear skies.  

 

With just 1.28" of rain measured in Central Park, May 2023 was the driest May since 1964 and the 13th driest May overall.  It had the same amount of precipitation as February (which was the 10th driest February).  Much of the month's rain, 0.77", fell on 5/20.

 

May's 14 days with humidity levels of 25% or lower was the most of any month this century (passing April 2010 which had 13); 11 of these days were consecutive, between 5/7 and 5/17.  May's previous most days of low humidity was seven (in 2014 and 2007).

 

The month was slightly cooler than average (-0.5 degrees) due to the average low, which was 1.4 degrees below average.  This was the first month this year with a below average temperature.  (Thru April, 2023 was about five degrees warmer than average.)

 

There was a 10-day period that had temperatures five degrees above average (May 7-16).  The other days of the month were three degrees below average.

 

After having two days with highs in the 90s in April, May's warmest reading was 87° (5/12).  The chilliest reading, 43°, came six days later.  And May's mildest low reading of 66° was lower than April's (70°).  The two days with lows in the 60s were the fewest in May since 2005. 

 

The first 19 days of May had 0.42" of rain, which was similar to the 0.40" of rain that fell in the first 21 days of April.   

 

On average May is 9.5 degrees warmer than April.  This year it was 5.1 degrees milder.  Only six other Mays have been closer to April's average temperature: 1945 (3.6 degrees milder); 2005 (3.8 degrees milder); 2017 (3.9 degrees milder); 2002 (4.6 degrees milder); 1968 (4.6 degrees milder); and 1915 (4.6 degrees). 

 

Here are recaps of the previous eight Mays:

2022

2021

2020

2019

2018

2017

2016

2015

 


Recap of April 2023: 2nd Mildest, 7th Wettest

 


April showers

 

April 2023 was 3.9 degrees above average and rainfall was about three and a half  inches above the norm, making the month the second mildest and seventh wettest April on record. 

 

After temperatures nine degrees milder than average occurred in the first two-and-a-half weeks of the month (including back-to-back days in the 90s), the last week of the month was five degrees below average.  This cool period is what prevented April from becoming the mildest on record (finishing 0.3 degrees behind April 2010).

 

As for rainfall, despite the first three weeks of April receiving just 0.40”, which was the least amount of rain thru 4/21 since April 1968, incredibly, the month became one of the wettest Aprils as 7.30" of rain fell in the last nine days of the month.  This rain came from three storm systems that each produced more than two inches of rain:  2.19” on 4/22-23; 2.79” on 4/28-29; and 2.32” on 4/30.  

 

April 13 and 14 had highs of 90° and 91°, respectively.  Only three other Aprils have had 90s on earlier dates: April 7, 2010; April 8, 1991; and April 12, 1977.  This was the 13th April to have highs in the 90s and the sixth with two or more (the most is three in 1976 and 2002).

 

The low of 70° on the morning of 4/14 has the distinction of being the earliest reading of 70+ on record.

 

The month’s chilliest reading was 37°.  Only four other Aprils have had their chilliest reading above that (last April was one of them; mildest is 42° in 1878); five other Aprils also had a chilliest reading of 37°.

 

Finally, the six-days between 4/11 and 4/16 were all ten degrees or more above average, with the three-day period of 4/12-14 being 25 degrees above average.  Meanwhile, the last week of April had below average temperatures each day - the longest streak of below average temperatures since December.

 

Chart - 5 mildest aprils

 

Here are April recaps of the previous seven years:

2022

2021

2020

2019

2018

2017

2016