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September 2015 Weather Recap: New York's Warmest on Record
New Record Set for Most Days with Highs of 80 Degrees+

A Trend Towards Fewer Cool Summer Nights (Lows in 50s)

Cool-and-drops

 

In the decades between 1910-1980 the average number of days with morning lows in the 50s during the summer (mid-June thru mid-Sept) was twelve.  Since then the number has fallen sharply, and in the current decade (thru 2019) the average has fallen to 3.4 days.  In 2016, for the first time, there were no lows in the 50s during the summer (1966 had one and six summers have had  two such days, including 2015).  The greatest number occurred in 1940 when there were 33 days.  In recent years the most 50-degree readings was 19 in 1986, and 13 in 2007 (which is the only summer in the past 21 years to have more than 10).  Since 1991 twelve summers have had no lows in the 50s in July or August (including 2014 thru 2019).  There were ten such summers in the years between 1910 and 1990.

 

AVERAGE NUMBER OF 50-DEGREE LOWS 
EACH SUMMER BY DECADE
  2010-2019      3.4
2000-2009      6.4
1990-1999      8.2
1980-1989      8.9
1970-1979    10.8
1960-1969    12.6
1950-1959    11.3
1940-1949    12.6
1930-1939    10.0
1920-1929    16.3
1910-1919    15.1
     
FEWEST/MOST COOL SUMMER NIGHTS
(June 16 - Sept 15)
         
Fewest   Most
1966 1   1940 33
2015 2   1963 27
2011 2   1927 25
1996 2   1926 24
1993 2   1914 24
1983 2   1946 23
1931 2   1918 22
2019 3   1924 21
2013 3   1962 20
2005 3   1986 19
1981 3   1965 19
1971 3   1915 19
1961 3      
Average =  11

 


 

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