National Weather Service United States Department of Commerce

100 Degree Temperatures or Higher in Sioux Falls, SD

Weather records for Sioux Falls, South Dakota commenced in 1893 and
continue to the present day.


The maximum temperature has reached 100 degrees or higher during
the months of May through September on 223 occasions.  This event
occurred in 61 of 128 years, slightly less than one half (47.7%) of
the years on record.


Monthly Data

100 degrees or higher occurs most often in July.  Breakdown by month
follows:

  

May 3 days
June 29 days
July 135 days
August 45 days
September 11 days

 

 

 

 

 

Annual Data

Occurrence of 100 degree or higher temperatures was most frequent
in 1936. The top 10 years for frequency of occurrence were:

 

1936 21 days
1988 14 days
1894 12 days
1934 10 days
2012 9 days
1974 8 days
1947 7 days
1941 7 days
1931 7 days
1930 7 days


 

Decadal Data


100 degrees or higher occurred most often during the decade from 1930-1939.
The breakdown by decades follows:

 

1893-1899 (partial decade) 19 days
1900-1909 9 days
1910-1919 12 days
1920-1929 8 days
1930-1939 58 days
1940-1949 22 days
1950-1959 13 days
1960-1969 10 days
1970-1979 31 days
1980-1989 23 days
1990-1999 6 days
2000-2009 3 days
2010-2019 9 days
2020- 0 days


Record Data


The highest temperature on record for Sioux Falls is 110 degrees,
reached on July 17, 1936 and June 21, 1988.

 

Highest temperatures recorded in each month from May through September:
 

         May              104 on May 30, 1934
          June             110 on June 21, 1988
          July              110 on July 17, 1936
          August         109 on August 24, 1936
          September   104 on September 4, 1913
                                            September 5, 1913
                                            September 6, 1913
                                            September 6, 1922
                                            September 6, 1976

 

The earliest occurrence of 100 degrees or higher was on May 25, 1967
 (100 degrees).

 

The latest occurrence of 100 degrees or higher was on September 19, 1895
 (103 degrees).


The records for consecutive days of 100 degrees or higher:

                 9 days    July  9 through July 17, 1936

                 6 days    July 19 through July 24, 1934 

                 5 days    July 16 through July 20, 1926

                 4 days    June 18 through June 21, 1988
                                July 22 through July 25, 1941
                                July 26 through July 29, 1935
                                June 27 through June 30, 1931

                3 days    July 5 through July 7, 1988
                               August 26 through August 28, 1973
                              July 17 through July 19, 1940
                              July 4 through July 6, 1936
                              July  9 through July 11, 1930
                              September 4 through September 6, 1913
                              June 24 through June 26, 1911
                              July 22 through July 24, 1901
                              July 21 through July 23, 1894

       

updated Sep '20