Late August Heat and Dry Weather

The current streak of 90-degree days at the airport through August 30 stands at five.  This is the longest stretch of 90-degree days for so late in the season since the 5-day streak experienced August 28–September 1, 2010.  Maximum temperatures during 2010 were higher...peaking at 96 during this 5-day stretch, and as high as 98 for the summer/year as a whole on August 11.

Current forecasts indicate the 90-degree weather at the airport will continue through Sunday and extend to 7 days.  This will be the longest such occurrence for so late in the season in 40 years, since the 10-day period from August 26–September 4, 1973.  The record is 12 days for so late in the season experienced in September 1891.  Ninety-degree weather at the airport will end on Monday.   There have been only 5 previous such occurrences of a 7-day string of 90-degree weather so late in the year since weather records began in 1871.

The current dry spell of no measurable rainfall at the Indianapolis airport is at 21 days.  This is the longest such dry spell since the June 5–28, 2012 streak of 24 days.  There have been 27 previous such occurrences in the Indianapolis area of this length or longer since weather records began in 1871.  The longest of record is 39 days set in August–September, 1908. 

Looking at just the last 50 years, a 21 day or longer streak has only happened 4 times: September 1963, October-November 1964, June 2012, and this year. Latest forecasts indicate that measurable rainfall will fall at the airport this Labor Day Weekend.

For the period June 1-August 30, Indianapolis is 4.03 inches below normal precipitation for the period.

Below are maps of the 30 day precipitation and 30 day percent of normal precipitation. 

30 Day precipitation. Click to enlarge 30 day percent of normal precipitation. Click to enlarge.
30 Day Precipitation, ending 8:00 AM August 30. Click to enlarge. 30 Day Percent of Normal Precipitation, ending 8:00 AM August 30. Click to enlarge.



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