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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

 


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

 

 

 


September 2020 Weather Recap: Cool & Dry Conditions Sandwiched Between Mild & Wet

September 2020

 

September 2020 was a touch milder than average (+0.8 degree), with close to an average amount of rain (3.94").  The month's story can be told by three eight-day periods: Sept. 3-9 was four degrees above average, Sept. 23-30 was six degrees above average, and the middle of the month (Sept. 15-22) was six degrees chillier than average, and rain-free.  Nearly all of the month's nearly four inches of rain was produced by three storm systems: 0.71" on 9/3, 1.20" on 9/10 and 1.61" on 9/29-30. 

 

The month's near average rainfall belied a 16-day streak with no measurable rain (Sept. 11-26).  This was the longest dry streak since the fall of 2017.  These dry conditions were largely due to a strong high pressure system that anchored itself over the Northeast for about a week.  It prevented moisture from hurricane Sally and tropical storm Beta from moving into the area and brought chilly air into the region, delivering the City's earliest lows in the 40s in seven years (49° on 9/21, 48° on 9/22).

 

Just seven days had highs of 80° or warmer, joining ten other Septembers since 1970 with this few.  The warmest reading was 85°, occurring on 9/3 and again on 9/4 (a typical September's hottest reading is around 90°).  The month's average high of 75.5° was the coolest since 2009.  And although the month's average temperature was a touch above average, it was the coolest September since 2013.

 

Chart - septembers by decades

 

Finally, although highs in the 80s/90s and lows in the 70s occasionally occur in October, if 2020's final reading of 80°+ remains at 9/10, it will be one of the earliest dates on record for this occurrence.  Meanwhile, the 58 lows of 70°+ is the third most after 1906 (61) and 2005 (60). 

Here are previous September recaps:

2019

2018

2017

2016

2015

2014

 


September 2019 - One of 10 Driest Septembers On Record

September

 

September 2019 was the first month since October 2013 to have less than an inch of rain and was the eighth driest September on record (0.95" was measured).  Thru 9/20 the month had average temperatures, then the last ten days were eight degrees warmer than average, resulting in the month being 2.4 degrees above average (24th warmest since 1869).  Although it was warmer than average, the month had just one low of 70º+, the fewest in September in ten years (there were none in 2009).  It was also the first September since 2011 not to have any highs of 90° or hotter. 

 

This September added to the record set last year when September 2018 was the fourth in a row with an average temperature of 70.0 degrees or warmer.  September 2019, however, was the "coolest" of the five.  However, a record that was tied last September, the sixth September in a row with a high in the 90s, wasn't broken this year as the hottest temperature this was 89°.  (It occurred on 9/23 - the same date as the month's only low in the 70s).

 

Chart - past five septembers

 

Two-thirds of September's paltry amount of rain fell in the first six days of the month, split mostly between Labor Day (when 0.30" fell mid-day, the most to fall on the holiday in sixteen years) and 9/6, when the most northernmost band of hurricane Dorian dropped 0.27" in less than an hour during mid-afternoon.

 

Chart - 10 Wettest Septembers

Finally, humidity of 15% or lower occurs very infrequently in New York, and when it has happened it's been confined to March and April (in the years since 2000) - until 9/19, when it dropped to 15% for a few hours that afternoon.  The last time the humidity was this low in September was on Sept. 11, 2001, when it bottomed out at 16%.

 

Here are recaps of the five previous Septembers:

2018

2017

2016

2015

2014

 

 Sept 15 - lower manhattan



 

 


September 2018 - A Month With Unusually Mild Nights

September 2018

 

September 2018 was 2.7 degrees warmer than average.  Like August, its average low was considerably more above average (+4.4 degrees) than its average high (+1.0).  This resulted in a vast difference in their historical rankings, with the average high ranking 60th warmest while the average low was ensconced among the ten warmest, at #4 (overall, the month was the 21st warmest).  The month's other significant story was its rainfall, which amounted to 6.19" - the most in September in seven years.  Furthermore, this was the sixth month this year with more than five inches of precipitation, joining ten other years with this many or more.  And if that wasn't impressive enough, 2018 became just the second year to have these six months concentrated in the first nine months of the year (1998 was the other year). 

Additional points of interest:  

  • The remnants of two hurricanes brought 1.38" of rain on 9/9-10 (Gordon) and 1.19" on 9/18 (Florence).  However, the month's biggest rainstorm was on 9/25 when 1.95" fell. Nearly half of that day's rain poured down in about an hour early in the afternoon.
  • The first full week of the month (week of 9/3) had four days in a row with highs that ranged from 89° to 93°.  The average high/low of 91/76 during these days was twelve degrees above average.  The first day of this hot spell fell on Labor Day, which had a high in the 90s for just the fourth time since 1980. 
  • This was the fourth September in a row with an average temperature warmer than 70.0 degrees, the longest such streak on record.  What's more, the month set a September record for the most days with lows of 67° or warmer (seventeen; the average number is six).  Despite this surfeit of warm nights, the number of days with highs of 80° or warmer was a bit below average (nine).
  • The month's average diurnal variation (the gap between the average high and low) was the smallest for September in more than 100 years (since 1908).  In 2018 it was 11 degrees, well below the average of 16 degrees (based on the past 100 years).
  • This was the record-tying seventh year in a row in which September experienced highs in the 90s, equaling in length the streak of 1940-1946.
  • Like September, August's average low also ranked fourth (its average high ranked 32nd).
  • Typically September is 2.5 degrees cooler than June, but this year it was one degree warmer.  This is the fifth time it's happened since 1980 (most recently in 2015).

 

 Chart - september warmest lows

Here are recaps of the four previous Septembers:

2017

2016

2015

2014

 


Recap of September 2017 Weather: The Great Rebound

ReboundAfter experiencing the coolest start to the month since 1975 (thru 9/12), a complete turnaround occurred, with temperatures nine degrees above average during a streak of sixteen unseasonably warm days (thru 9/28).  This included a record high of 91° on 9/25, the first 90-degree reading since 8/1, and the latest temperature in the 90s since 1970.  As a result of this rebound the month ended up being 2.5 degrees above average, the fourth year in a row in which September had warmer than average temperatures.  (The final two days of the month reverted back to the cool conditions experienced at the beginning of September, but by then such temperatures were close to average.)  Other highlights:

 

 

  • With just 2.00" of rain, September was the driest month since August of last year (when 1.97" was measured), and the sixth driest September since 1980.  Much of the rain fell in a 12-hour period on the night of 9/2 into the early morning hours of 9/3 (1.27").  No rain fell in the last 11 days of the month, tying an equally long streak in February as the longest dry spell of the year.  (This dry spell continued into the first week of October.)  The month's last rainfall, 0.22" on 9/19, was produced by Hurricane Jose, which New York was on the western edge of.
  • September's average temperature was 3.5 degrees cooler than August's, the closest September has been to August since 1961 (the average difference is 7.2 degrees). 
  • This was the sixth September in a row to have at least one high in the 90s, the longest such streak since one of seven years from 1940 to 1946 (which would be tied in Sept. 2018).
  • The last day of the month and 9/2 had the month's coolest reading, 54°.  However, while this reading was eleven degrees below average on 9/2, it was just one degree below average on 9/30.
  • Although it fell during the cool first part of September, Labor Day was sunny and pleasant with a seasonable high/low of 80/61.
  • The average high/low of 74/59 in the first twelve days of September was followed by a warm 82/69 from Sept. 13-28.
  • Embedded in the sixteen-day streak of unseasonably warm temperatures were five days in a row (Sept 23-27) with mean temperatures 10 degrees or more above average, the longest such streak in 20 months (October 2017 would have a streak that lasted seven days).  Temperatures were 14 degrees above average during these five days, with an average high/low of 87/69.
  • This was the third September in a row with an average temperature of 70.0 degrees or warmer, making this the longest such streak on record.

 

Sept 2017

 

Here are links to September summaries of the previous three years:

September 2016

September 2015

September 2014

 

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September 2016 Weather Review - Summer Hangs On

September songSeptember 2016 was characterized by seasonable temperatures at both the beginning and end of the month and unseasonably warm conditions during the days in between (Sept. 6-23); temperatures during this summery two-and-a-half week period were nearly seven degrees above average.  As a whole the month was 3.8 degrees warmer than average, tying Sept. 1983 and 1884 as the tenth warmest on record (this followed the third hottest August).  Three days had highs in the 90s and seven had mean temperatures that were ten degrees or more above average (one of which was the first day of autumn).  There were just five days with below average temperatures.  The most below average was 9/30, with a high of 59/56 (it was the high that was below average, by 11 degrees) - this was the first day in September with a high in the 50s in fifteen years. 

 

50 Deg Highs in Sept 

OTHER SEPTEMBER HIGHLIGHTS

  • The high on Labor Day was 84°, which was the same as Fourth of July and very close to Memorial Day's high (82°).  This was just the third time since 1970 that that three summer holidays had very similar highs.  But whereas Memorial Day's high was seven degrees above average and Labor Day's five above, 4th of July's was at the seasonal average.
  • On Sept 11 the heat index was 101°.
  • The three 90-degree days in September brought the year's total to 22, five above average and the most since 2010.  The 91-degree reading on 9/14 was the latest high in the 90s since 1995 (when it occurred on 9/15).
  • Although September's rainfall was below average, more fell than in August (2.79" vs. 1.97").  There were no storms that produced an inch or more of rain but three had a half-inch or more (on 9/14, 0.56" poured down in an hour during a late afternoon thunderstorm).  The rainiest day was 9/19 when 0.68" fell.  Since March, all but one month (July, with 7.02") has had below average rainfall, resulting in a deficit of nearly 10 inches in these seven months (20.91" vs. 30.78") .

 

September sun

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The Towering Clouds & Beautiful Sunsets During Summer 2016

Sheridan sq sunset

 

I've always had an appreciation for clouds and sunsets.  Five years ago I probably wouldn't have been able to write this post because I didn't have my smartphone with its camera.  Now I'm able to snap photos at a moments notice, enabling me to capture this summer's overabundance of photo-ready thunderheads and stunning sunsets.  And because I live in the West Village I probably notice them more since the low-rise buildings make the sky much more accessible than in Midtown Manhattan.  I hope you enjoy the photo revue that follows ... 

 

 

Sunset in my face
The photo display begins with one of me along the Westside Highway at dusk during Memorial Day weekend.

 

Rays of sun
Rays of the setting sun stream over Sheridan Square in Greenwich Village.

 

Sunset in mckees rocks
I took this photo during a June visit to Pittsburgh to see my mother. These clouds brought to mind those I'd often see over the Atlantic Ocean close to sundown on Fire Island.

 

July 1 2016
Taken on July 1, this photo shows a thundercloud from a storm that struck half an hour earlier. Although it was around 9PM the top of the cloud was catching the rays of sun that was below the horizon.

 

Sun thru slate gray
Early evening sun filtered through a slate gray sky over Sheridan Square.

 

Towering thunderclouds in glen rock
This isn't a cloud formation in New York but it deserves an honorable mention.  I snapped the photo of this breathtaking thunderhead during a weekend visit to south central Pennsylvania in the midst of a late July heat wave.

 

Moonshine
Taken from my kitchen looking east as the full moon was rising.

 

Sunset aug 3
This was the view on 7/28 looking east from the 44th floor of an apartment building on the  Upper West Side. The light pastel coloring was the result of a fire in a warehouse in Long Island City (Queens) an hour earlier.

 

Gathering clouds by grand central
Taken as I was walking to the subway after work on 42nd St. across from across from Grand Central Terminal.

 

Glorious clouds and sun
Looking west from Sheridan Square at around 6PM in mid-August. Seeing it I felt I was in the presence of the Divine.

 

Cloud tower
Early evening on a hot day in mid-August.  These mountainous clouds brought a quick downpour to upper Manhattan, but not to Greenwich Village.

 

Towering
Similar view and thunderclouds as the previous photo but on a different day one month later.

 

10 charles street
The same cloud formation as it moved behind the apartment building at 10 Charles St.

 

Puffy and wispy
Wispy and puffy clouds over the West Village.

 

Sunset christopher pier
Sunset on the Saturday of Labor Day weekend, taken on Christopher St. pier, which looks out across the Hudson River.

 

Pastel sundown
This is how the sun's rays from the above sunset reflected on the bank of towering clouds in the east.  Reminds me of rainbow sherbet.

 

Up from subway
I snapped this photo shortly after I came out of the Christopher St. subway station in the early evening. This view is looking east.

 

Orange red sunset
Taken the evening of Sept. 11 as I left the gym on Seventh Ave. South.

 

Sept14 sunset
Taken on Sept. 14 close to the West Side Highway in Chelsea, shortly after a late afternoon thunderstorm. A few hours earlier the temperature was in the low 90s, the last 90-degree day of the year.

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Lga sunset
6PM on Sept. 15, awaiting take-off at LaGuardia Airport.

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Golden sunset
Finally, a golden sunset on Sept. 17 during a visit to my childhood neighborhood in McKees Rocks, PA.

 

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September 2015 Weather Recap: New York's Warmest on Record

Trophy.winner

 

After experiencing near record-warmth in May (second warmest) and August (third warmest), 2015 can now lay claim to the warmest September on record, easily topping 1961's previous record by 0.9 degrees.  Like much of the summer, September's average temperature was greatly influenced by the lack of any incursions of chilly air masses.  The coolest reading was 56°, which matched Sept. 1921 for the mildest minimum reading for the month.  (September's coolest reading is typically around 49.)  And only five days had lows in the 50s, which was well below the average of 13.  Finally, the month joined Sept. 1968 and 1921 as the only Septembers to have no high temperatures cooler than 70°.  A typical September sees five or six such days.  Other interesting facts:

 

  • Nine days had mean temperatures (average of the high/low) that were 10 degrees or more above average, but that was no match for the 14 such days in Sept. 1961.  (1961's average high was just 0.1 degree lower than 2015, but 2015's average low was 1.7 degrees milder.)
  • This September matched that of 2005 by having just one day with a below average mean temperature.  However, in 2015 that day was just one degree below average while 2005's was four degrees below the norm.  (And Aug. 2015 had only a handful of days that were below average, and they were all also just one degree below average.)
  • This was the first time since 1998 that September was warmer than June, which was close to average (74.4 vs 71.2).
  • Despite this year's record warmth, Sept. 1961 had more 90-degree days (8 vs. 6) while Sept. 2005 had more 80-degree days (23 vs. 19).
  • The hottest high temperature of the year occurred on 9/8 when the mercury reached a record 97 degrees.  (However, the year's highest mean temperature occurred on 7/20, with a high of 94/82).

 

Highline

 

  • The month saw the end of the longest streak of 80-degree days on record, 62 days.  Then shortly thereafter another warm temperature record was established - most total days  of 80-degree+ in a year (which grew to 114 days by the end of the month).  In both instances the previous record holder was 1944.  (Despite this record number of 80-degree days, 2015 ranks 12th for most lows of 70 or warmer.)
  • The month was on the dry side and featured a 15-day stretch with no rain (the second longest streak of the year).  In total 3.28" of rain fell, with most of it falling on two days - a record 1.51" on 9/14 and 1.27" on 9/30.  And although the month had below average rainfall (one inch below average), it had considerably more rain than any of the next eight warmest Septembers, which averaged just 1.58".

 

10 WARMEST SEPTEMBERS 
(Since 1900)
           
  Mean Average Max Min
 Year Temp High Low Temp Temp
2015 74.4 82.6 66.3 97 56
1961 73.5 82.5 64.6 95 49
2005 73.3 81.6 65.0 92 50
1959 72.3 80.9 63.6 93 46
1931 72.3 81.3 63.3 99 49
1921 72.1 80.7 63.5 96 56
1930 72.0 79.8 64.1 88 52
1983 71.8 80.5 63.0 99 49
1971 71.5 77.3 65.8 91 49
2010 71.1 78.7 63.4 96 54
           
Source: NOAA Local Climatological Data

 

 

 

 

 

 

 

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Summer of 2015 Highlighted by Record Streak of Days Above 80 Degrees

80Plus

 

The Arctic air that was entrenched over the Northeast during the harsh winter of 2015 became a distant memory later that summer when New York experienced 62 days in a row with high temperatures of 80° or warmer (July 10-Sept. 9).  This was a record streak, besting the previous record from 1944 by three days.  (On the day the streak ended the high was 79°.)  Of course, summertime temperatures in the 80s or warmer aren't unusual; what was unusual is that for nine weeks there were no incursions of Canadian air or back-door cold fronts from New England.  (These are responsible, on average, for twelve days with highs in the 70s or cooler in July and August.)  The average high during these weeks was 87.5°, five degrees above average.  Below are some other tidbits of interest:

 

  • This year's streak joined ten others that were five weeks or longer.  Among them, four have occurred since 2005.
  • 2015's s streak included 19 days in the 90s, but 1944's and 1966's (second and fifth longest, respectively) had even more, 30 and 23.  And among the ten longest streaks, the streak in 1966 was the hottest, with an average high temperature of 91°.
  • 2015's streak was instrumental in making the August 2015 the third hottest on record and July/August the fifth hottest.
  • Finally, this year's streak of warm days matched a streak of cold weather during the winter when another record was set - 61 days in a row with high temperatures that never went above 45°. 

 

LONGEST STREAKS OF 80-DEGREE+ HIGHS
           
# of      Average Days Days
Days Year Dates High 90s 80-81
62 2015 July 10 - Sept 9 87.5 19 4
59 1944 June 26 - Aug 23 89.7 30 5
41 2011 July 4 - Aug 13 88.8 17 1
41 1943 July 8 - Aug 17 87.4 14 1
40 1966 June 20 - July 29 91.0 23 2
37 1917 July 16 - Aug 21 86.1 5 3
36 1999 July 15 - Aug 19 89.5 17 2
35 2008 July 7 - Aug 10 86.4 7 7
35 2005 Aug 20 - Sept 23 84.2 3 6
35 1998 July 9 - Aug 12 85.5 3 3
35 1953 June 18 - July 22 88.6 15 2
           

 80degdays

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