Quantcast

« August 2014 | Main | October 2014 »

September 2014

Low Temperatures of 70 Degrees or Warmer: An Analysis

70s

 

A typical year in New York sees 37 days with lows in the 70s or 80s, with the first coming around June 4 and the last on Sept. 11.  (This is nine days longer than the "season" for 90-degree high temperatures.)  In the period 1970-2020, the number of these days has ranged from just 14 in 1992 to 60 in 2005  (2010, the year with the hottest summer, had 55.)  The longest streak of lows of 70°+ is 22 days and it occurred twice, in 1980 and 2010.  There was also a 21-day streak in 1988.  The longest streak of days with lows of 75°+ (which we get eight of each year) occurred in the summer of 2013 when there were eight consecutive days in mid-July. 

 

MOST & LEAST 70-DEGREE LOWS
(Since 1970)
       
MOST   Days First Last
2005 60 June 8 Oct 7
2015 56 May 1 Sept 29
2010 55 June 4 Sept 28
2018 54 May 3 Oct 10
1980 54 June 25 Sept 22
       
Average 37 June 4 Sept 11
       
LEAST   Days First         Last
1992 14 June 8 Sept 9
2009 18 July 16 Aug 26
2000 23 May 8 Sept 12
1975 23 June 19 Aug 26
1976 24 April 18 Aug 28
       

Save

Save

Save

Save

Save

Save

Save

Save

Save


Summer of 2014 Weather Recap - Not As Cool As it Seemed

Summer2014

 

Ask most anyone about the summer of 2014's weather and they'll probably remark how comfortable it was, even cool.  This is most likely because there were so few 90-degree days, just six (normal is sixteen for June-July-August).  However, the average temperature for meteorological summer (June 1 - Aug. 31) was 0.1 degree above average.  (June was +1.0, July -0.4 and August -0.7).  Compared to the previous four summers, however, this summer felt cool because those summers were on the torrid side (especially 2010, which was the hottest summer on record).  And although the summer of 2014 was the coolest in five years, 2009 was much cooler, 2.3 degrees below average. 

 

Average Summertime Temperatures
(Meteorological Summer)
     
  Mean Temp Departure
2014 74.4 +0.1
2013 75.7 +1.4
2012 75.6 +1.3
2011 76.0 +1.7
2010 77.8 +3.5
2009 72.0 -2.3

 

What distinguished this summer from those of the past five was that none of the three months this year had a wide variation from the average, while the others had at least one month that varied significantly from the average.

 

Monthly Departures From Normal
       
  June July Aug
2014 +1.0 -0.4 -0.7
2013 +1.2 +3.3 -0.6
2012 -0.4 +2.3 +1.5
2011 +1.1 +3.8 +0.2
2010 +3.5 +4.9 +2.4
2009 -3.7 -3.8 +0.6
       

 

And while there were no official heat waves (i.e., three days in a row with highs in the 90s), there were four three-day periods with highs of 87+, two each in July and August (and there were back-to-back 89-degree days in mid-June).  Interestingly, while there were six days with highs in the 90s, the warmest daily mean temperature wasn't one of those days - it occurred on June 18, when the high/low was 89°/76°.

 

HOTTEST DAYS - SUMMER 2014
(Ranked by Daily Mean Temp)
       
  High Low Mean
June 18 89 76 82.5
Aug 31 90 73 81.5
July 2 91 72 81.5
July 8 91 71 81.0
July 7 90 72 81.0
Aug 5 90 71 80.5
July 1 89 72 80.5
Aug 27 90 70 80.0
July 23 88 72 80.0
June 17 89 71 80.0

 

Finally, there were 29 days with lows in the 70s (an average summer has 33), with all but two of them between 70°-72°.  The outliers were June 18, when the low was 76°, and the last day of August, which had a low of 73°.