Climate Statistics for the First Day of Autumn

The Autumnal Equinox is set to occur at 1044 am CDT on Monday, September 22.  While it has never snowed on the first day of Autumn (but has snowed as early as September 18 with a trace at Huron and Sioux Falls!) , there has been a great variety in conditions typical of the start of the transition season.  Here are some of the climatic extremes for Sioux Falls, Huron, and Sioux City.

Sioux Falls              
                     
Coldest Minimum Temp.     Warmest Maximum Temp.
Year Date Max Min Precip   Year Date Max Min Precip
1983 9/23 66 28 0   1935 9/23 92 66 0
1895 9/23 69 31 0   2007 9/23 89 62 0
1896 9/22 63 31 0   1938 9/23 88 55 0
1928 9/23 57 32 0   1898 9/22 87 53 0
1893 9/22 72 33 0   1919 9/23 86 42 0
1916 9/23 76 33 0   1908 9/23 85 48 0
1949 9/23 68 33 0   1911 9/23 85 59 0
1971 9/23 71 33 0   1917 9/23 85 52 0
1990 9/23 64 33 0   1937 9/23 85 70 0.27
            1940 9/22 85 63 0
                     
Warmest Minimum Temp.   Coldest Maximum Temp.  
Year  Date Max Min Precip   Year Date Max Min Precip
1937 9/23 85 70 0.27   1965 9/23 43 35 0
1930 9/23 83 69 0   1942 9/23 49 34 T
1929 9/23 80 68 0   1946 9/23 50 38 0.01
1958 9/23 82 68 T   1951 9/23 51 38 1.01
1935 9/23 92 66 0   1961 9/23 51 41 0.02
1940 9/22 85 63 0   1997 9/22 53 48 0.89
1968 9/22 78 63 0.99   2000 9/22 53 44 0.44
2007 9/23 89 62 0   1928 9/23 57 32 0
            1991 9/23 57 34 0.68
            2006 9/22 57 52 0.34
Wettest                  
Year Date Max Min Precip            
1951 9/23 51 38 1.01            
1968 9/22 78 63 0.99            
1997 9/22 53 48 0.89            
1913 9/23 69 40 0.70            
1991 9/23 57 34 0.68            
2000 9/22 53 44 0.44            
1970 9/23 64 42 0.40            
1920 9/23 77 60 0.39            
2006 9/22 57 52 0.34            
2004 9/22 70 56 0.33            
                     
Sioux City              
                     
Coldest Minimum Temp.     Warmest Maximum Temp.
Year Date Max Min Precip   Year Date Max Min Precip
1983 9/23 65 31 0   1938 9/23 95 52 0
1971 9/23 72 32 0   1935 9/23 92 68 T
1896 9/22 66 34 0   1891 9/23 90 66 0
1965 9/23 54 34 0   1921 9/23 90 56 0
1991 9/23 66 34 0.09   2007 9/23 88 55 0
1916 9/23 71 35 0.09   1940 9/22 87 65 0
1942 9/23 57 35 0.01   1999 9/23 87 42 0
1990 9/23 65 35 0   1908 9/23 86 59 0
2003 9/23 82 37 0   1892 9/22 86 53 T
                     
Warmest Minimum Temp.   Coldest Maximum Temp.  
Year  Date Max Min Precip   Year Date Max Min Precip
1930 9/23 85 70 0   1961 9/23 52 40 T
1935 9/23 92 68 T   1965 9/23 54 34 0
1958 9/23 78 68 T   1951 9/23 55 43 0.24
1891 9/22 90 66 0   1942 9/23 57 35 0.01
1968 9/22 82 66 1.48   1944 9/22 57 48 0.08
1940 9/22 87 65 0   1946 9/23 57 38 T
1929 9/23 85 64 0   1997 9/22 57 50 1.08
2004 9/22 83 63 0.16   2000 9/22 58 50 0.88
1915 9/23 73 62 T            
                     
Wettest                  
Year Date Max Min Precip            
1937 9/23 84 59 2.18            
1968 9/22 82 66 1.48            
1997 9/22 57 50 1.08            
1920 9/23 77 58 0.92            
1963 9/23 69 54 0.90            
2000 9/22 58 50 0.88            
1970 9/23 60 48 0.47            
1926 9/23 71 42 0.43            
                     
Huron                  
                     
Coldest Minimum Temp.     Warmest Maximum Temp.
Year Date Max Min Precip   Year Date Max Min Precip
1887 9/23 59 26 T   1935 9/23 93 60 0
1942 9/23 49 28 0.03   1937 9/23 92 50 0.20
1990 9/23 67 29 0   2007 9/23 91 61 0
1895 9/23 69 30 0   1892 9/22 91 45 0
1928 9/23 59 30 0   1938 9/23 90 54 0
1989 9/22 55 30 0   1940 9/22 90 64 0
1951 9/23 50 31 0.12   1886 9/22 89 49 T
                     
Warmest Minimum Temp.   Coldest Maximum Temp.  
Year  Date Max Min Precip   Year Date Max Min Precip
1958 9/23 88 69 0   1965 9/23 42 34 0.01
1891 9/23 85 67 T   1942 9/23 49 28 0.03
1930 9/23 88 65 T   1951 9/23 50 31 0.12
1940 9/22 90 64 0   1960 9/22 50 41 0.26
2007 9/23 91 61 0   1991 9/23 53 32 0.64
1935 9/23 93 60 0   1946 9/23 54 40 0.02
1917 9/23 85 59 0   1910 9/23 55 45 0
1920 9/23 77 59 1.17   1989 9/22 55 30 0
1904 9/23 87 58 0.01   1944 9/22 55 46 0.12
1923 9/23 83 56 0   1961 9/23 55 39 0.03
            1997 9/22 55 51 0.60
Wettest                  
Year Date Max Min Precip            
1920 9/23 77 59 1.17            
2004 9/22 60 51 0.71            
1991 9/23 53 32 0.64            
1997 9/22 55 51 0.60            
2006 9/22 56 51 0.50            
1968 9/22 70 54 0.33            
                     



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