Decatur, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 19° 36° -23° (1977) 73° (1909) 2.14" 4.8"
February 23° 41° -25° (1905) 76° (1972) 2.07" 4.2"
March 32° 53° -10° (1978) 89° (1929) 2.59" 1.7"
April 43° 66° 15° (1982) 93° (1987) 3.67" 0.2"
May 53° 76° 26° (1903) 101° (1934) 4.79" 0"
June 62° 85° 38° (1917) 105° (1954) 4.5" 0"
July 66° 88° 45° (1930) 113° (1954) 3.98" 0"
August 64° 86° 35° (1986) 106° (1983) 3.77" 0"
September 56° 80° 27° (1928) 104° (1954) 3.14" 0"
October 45° 68° 12° (1925) 96° (1953) 3.25" 0"
November 34° 53° -3° (1929) 83° (1933) 3.71" 0.2"
December 23° 39° -22° (1983) 72° (1970) 2.78" 4.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Apr 1 38° 60° 20° (1926) 87° (1946) 0.11" 0"
Apr 2 38° 61° 20° (1961) 85° (1940) 0.11" 0"
Apr 3 38° 61° 16° (1987) 85° (1946) 0.11" 0.1"
Apr 4 39° 62° 20° (1975) 86° (1929) 0.1" 0"
Apr 5 39° 62° 15° (1920) 85° (1988) 0.11" 0"
Apr 6 40° 62° 18° (1982) 85° (1967) 0.1" 0"
Apr 7 40° 63° 15° (1982) 83° (1948) 0.12" 0"
Apr 8 40° 63° 18° (1972) 85° (2001) 0.11" 0"
Apr 9 41° 64° 18° (1997) 85° (2001) 0.11" 0"
Apr 10 41° 64° 19° (1960) 88° (1930) 0.12" 0"
Apr 11 41° 64° 23° (1973) 93° (1930) 0.12" 0"
Apr 12 42° 65° 21° (1957) 91° (1930) 0.11" 0"
Apr 13 42° 65° 21° (1950) 88° (1930) 0.12" 0.1"
Apr 14 42° 66° 23° (1950) 88° (1941) 0.11" 0"
Apr 15 43° 66° 24° (1928) 85° (1977) 0.13" 0"
Apr 16 43° 66° 26° (1904) 89° (1977) 0.12" 0"
Apr 17 44° 67° 24° (1904) 91° (1937) 0.13" 0"
Apr 18 44° 67° 27° (1983) 87° (1977) 0.12" 0"
Apr 19 44° 68° 21° (1983) 86° (2002) 0.13" 0"
Apr 20 45° 68° 25° (1983) 88° (1936) 0.13" 0"
Apr 21 45° 68° 27° (1901) 89° (1987) 0.13" 0"
Apr 22 45° 69° 25° (1936) 90° (1925) 0.13" 0"
Apr 23 46° 69° 24° (1956) 92° (1925) 0.13" 0"
Apr 24 46° 69° 23° (1910) 90° (1925) 0.13" 0"
Apr 25 46° 70° 25° (1910) 88° (1924) 0.13" 0"
Apr 26 47° 70° 28° (1919) 88° (1925) 0.13" 0"
Apr 27 47° 70° 29° (1928) 87° (1914) 0.14" 0"
Apr 28 47° 71° 27° (1928) 88° (1906) 0.14" 0"
Apr 29 48° 71° 30° (1988) 93° (1987) 0.14" 0"
Apr 30 48° 71° 31° (1908) 91° (1901) 0.15" 0"
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