Hottest so Late in the Year Four-Day Heat Wave in 72 Years

The heat wave of August 31-September 3, 2011 was very unusual.  There have been only 7 times since weather records began in 1871 that the temperature reached 99 degrees on 3 or more consecutive days.  The last time this occurred was July 6-9, 1988.  The only time this occurred later in the year was September 13-15, 1939. 

The 100 degree reading on September 3 was the second time this year.  The temperature has never exceeded 100 degrees during the month of September since weather records began in 1871.  Previous to September 3, there had been only 5 times in September when the temperature reached 100 degrees...twice in both 1939 and 1953 and the last time on September 5, 1954.

The four-day heat wave of August 31-September 3 was the hottest for so late in the season since September 13-15, 1939.  The number of 90-degree days during 2011 is 42 as of September 13.  This is the most  90-degree days during a year since 1988.  Previous to September 3, the last time the temperature reached 100 degrees on 2 or more days was in 1988.  Click here for additional Summer Hot Weather Statistics for the Indianapolis area.
 

Maximum Days in a Month of 90 degrees and higher at Indianapolis
Month Average Maximum Year
April  0.0  1 1925, 1942
May  0.1  6 1941
June  2.7 18 1934, 1954
July  5.2 25 1901
August  5.0 23 1983
September  1.5 12 1891, 1897
October  0.1  2 2007
Annual 14.6 58 1983


Years with More than 36 days of 90-degree Weather
1983 58
1936 55
1954 50
1988 49
1934 46
1953, 1941 45
1894 43
2011, 1933, 1913, 1895 42
1931, 1914 41
1952, 1944, 1919 39
1901, 1887 38
2010, 2007, 1966 37
Annual Average 14.6

 

Years with More than 9 days of 95-degree Weather
1936 31
1988 23
1887 19
1933 18
1934 17
2011, 1953 16
1983, 1954, 1941, 1930, 1914, 1913, 1901 14
1931 13
1881 12
1940, 1894 11
2010 10
In 57 years since 1871 the temperature did not reach 95 degrees.   0

Years at Indianapolis With Daily Temperatures of 100 Degrees
                            Year           Jun            Jul          Aug        Sep          Ann
1936 0 9 3 0 12
1934 4 6 0 0 10
1988 1 3 1 0 5
1954 1 2 0 1 4
1953 1 0 0 2 3
1881 0 2 1 0 3
1887 0 3 0 0 3
1901 0 3 0 0 3
1930 0 3 0 0 3
2011 0 1 0 1 2
1939 0 0 0 2 2
1895 1 0 1 0 2
1911 0 2 0 0 2
1916 0 2 0 0 2
1918 0 0 1 0 1
1913 0 1 0 0 1
1914 0 1 0 0 1
1940 0 1 0 0 1
1941 0 1 0 0 1
1952 0 1 0 0 1
1980 0 1 0 0 1
Record Total 8 42 7 6 63
Annual Average 0.1 0.3 0.1 0 0.4

Indianapolis Area 
Occurrences of 2 or more consecutive days with
Maximum Temperature 100 degrees F or higher
Years: 1871-2011

Rank  # Days   End Date
  1      9    7/15/1936
  2      6    7/25/1934
  3      3    6/29/1934
  4      2    7/ 9/1988
  5      2    9/ 2/1953
  6      2    9/15/1939
  7      2    8/22/1936
  8      2    7/28/1916
  9      2    7/ 4/1911
 10      2    7/22/1901
 11      2    7/18/1887
 12      2    7/11/1881


Statistics and Tables Updated at 10:30 am EDT September 7, 2011.



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