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September 2015

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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Recap of August 2015: New York's Third Hottest on Record

Hot.august

 

Just three months after an exceptionally warm May, which was New York's second warmest on record, August 2015 crossed the finish line as third warmest.  Although the number of 90-degree days, eight, was double the average, what really contributed to the month being so warm was the absence of any outbreaks of Canadian air masses.  Every day had a high of 80° or warmer - a first for August (a typical August sees seven days with highs cooler than 80°.)  Only four days had below-average mean temperatures; the most below average was just -1.5 degrees on two days.  Below are a number of other noteworthy findings:  

   

  • An extended streak of 80-degree days that began on July 10 continued through August.  By 8/31 it had grown to 53 days, making it the second longest such streak - and it was expected to eclipse 1944's all-time streak of 59 days (it did). 
  • The month was also characterized by plentiful sunshine, with 23 days that were either sunny or clear.  Cloud cover is measured on a scale of 0 to 10, with 0 being clear and 10 overcast.  August averaged a cloud cover rating of 2.1, making it the sunniest month of the past five years (this information is reported sporadically in prior years).  This included sunny/clear sky conditions for the first nine days of the month as well as the final six days.
  • Four years ago August 2011 became the wettest month on record, with 18.95" of rain measured.  Since then the four Augusts that followed have all had less than three inches of rain.  This August measured 2.35", about half the typical amount.  Half of the month's rain poured down during the morning of 8/11.
  • July (2.3 degrees above average) and August (3.8 degrees above average) rank as the fifth warmest July/August combo on record (tied with 1995).  What makes 2015 stand out is that there were a lot less 90-degree days than the other July/August combos ranked in the top 10. 

 

FIVE HOTTEST AUGUSTS
               
  Average   Hottest Days of  
  High Low Mean Temp 90+ 80+ Rain
1980 88.3 72.2 80.3 97 15 28 1.16"
2005 87.1 72.2 79.7 99 9 28 3.96"
2015 86.9 71.0 79.0 95 8 31 2.35"
1988 87.0 70.5 78.8 99 10 26 2.19"
2001 86.5 70.8 78.7 103 8 28 2.56"

 

HOTTEST JULY/AUG COMBOS
         
  Mean Temp Days of
  July Aug July/Aug 90+
1980 79.3 80.3 79.8 26
1955 80.9 78.1 79.5 24
2010 81.3 77.4 79.4 28
1988 79.3 78.8 79.1 23
2015 78.8 79.0 78.9 13
1995 79.2 78.6 78.9 24
1993 80.2 77.2 78.7 30
2005 77.5 79.7 78.6 17
1983 79.5 77.7 78.6 23
1944 79.4 77.8 78.6 28
         

 Sweaty

 

 

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