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The 'Last Gasp' of Summer - Noteworthy Late Summer Warm Spells

July 2015 Weather Recap: A Very Warm Second Half

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  • Although July 2015 was warmer than average (+2.2 degrees), three of the Julys since 2010 were hotter.  Overall it was the 19th hottest July since 1900.  Only six days were cooler than average.  After being close to average during the first two-and-a-half weeks of the month, temperatures from July 19-31 were nearly five degrees above average.
  • The number of 90-degree days was five, which is below the average number of eight.  However, eight days had highs of 88° or 89°, which tied July 1994 for the greatest number of upper-80s highs (going back to 1970).
  • All but two days had highs of 80 or warmer (an average July has six days with highs below 80).  Since 1970 only three Julys have had more 80-degree days (2011, 1994 and 1983). 
  • It appeared the month was going to be the driest July since 2002, but then 1.95" of rain poured down during the afternoon of 7/30, which was as much rain as fell in the previous four weeks.  This was the greatest daily rainfall since 1/18, when 2.10" fell.  It was also the first rain to fall on 7/30 in fifteen years.
  • The month's hottest temperature was 96° on 7/29; the warmest low was 82° on 7/20.  At the other end of the temperature spectrum, July's coolest reading was 64° on 7/16; the coolest high was 75° on 7/4. 
  • Finally, although July 2015 and 2012 had the same mean temperature, their diurnal variations (i.e., the difference between high and low) were very different, with 2015's being 14.2 degrees and 2012's at 17.0.  Although this year's average high was 1.4 degrees cooler than July 2012, the average low was 1.4 degrees warmer.

 

JULY TEMPERATURE AVERAGES SINCE 2010
             
  Average   Degrees Highs of
  High Low Mean +/- 90+ 88/89
2015 85.9 71.7 78.8 +2.3 5 8
2014 83.5 68.8 76.1 -0.4 3 3
2013 86.3 73.4 79.8 +3.3 10 3
2012 87.3 70.3 78.8 +2.3 10 6
2011 88.9 71.6 80.2 +3.7 14 3
2010 90.1 72.6 81.4 +4.9 20 5

 

 

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William

every day but three had a low temperature of 68° or warmer, tying 1906 and 1901 as the most of any July. this was also the first of twenty consecutive months with an above average mean temperature.

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