Illiopolis, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 17° 35° -23° (1977) 73° (1909) 2.05" 7.1"
February 22° 41° -25° (1905) 76° (1972) 1.95" 6.4"
March 32° 53° -10° (1978) 89° (1929) 3.2" 3.1"
April 42° 65° 15° (1982) 93° (1987) 3.58" 0.4"
May 52° 76° 26° (1903) 101° (1934) 4.47" 0"
June 61° 85° 38° (1917) 105° (1954) 3.9" 0"
July 65° 88° 45° (1930) 113° (1954) 4.54" 0"
August 63° 86° 35° (1986) 106° (1983) 4.14" 0"
September 55° 80° 27° (1928) 104° (1954) 2.98" 0"
October 44° 68° 12° (1925) 96° (1953) 2.74" 0"
November 34° 52° -3° (1929) 83° (1933) 3.32" 1.3"
December 23° 39° -22° (1983) 72° (1970) 2.87" 5.8"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 47° 71° 26° (1903) 90° (1901) 0.14" NA
May 2 47° 71° 30° (1966) 91° (1901) 0.14" NA
May 3 47° 72° 30° (1967) 90° (1949) 0.14" NA
May 4 48° 72° 31° (1907) 92° (1952) 0.14" NA
May 5 48° 72° 32° (1917) 93° (1952) 0.14" NA
May 6 48° 73° 28° (1944) 91° (1949) 0.14" NA
May 7 49° 73° 27° (1989) 88° (1926) 0.14" NA
May 8 49° 74° 33° (1923) 89° (1930) 0.14" NA
May 9 49° 74° 29° (1980) 95° (1934) 0.14" NA
May 10 50° 74° 27° (1966) 94° (1928) 0.14" NA
May 11 50° 75° 31° (1907) 89° (1922) 0.15" NA
May 12 50° 75° 30° (1981) 90° (1902) 0.15" NA
May 13 51° 75° 32° (1960) 89° (1956) 0.15" NA
May 14 51° 76° 33° (1920) 93° (1987) 0.15" NA
May 15 51° 76° 35° (1973) 90° (2001) 0.15" NA
May 16 52° 76° 33° (1997) 92° (2001) 0.15" NA
May 17 52° 76° 36° (1973) 92° (1987) 0.15" NA
May 18 52° 77° 34° (2002) 93° (1962) 0.15" NA
May 19 53° 77° 34° (1929) 93° (1987) 0.15" NA
May 20 53° 77° 35° (1954) 95° (1987) 0.15" NA
May 21 53° 78° 32° (1929) 96° (1925) 0.15" NA
May 22 54° 78° 35° (1963) 97° (1925) 0.15" NA
May 23 54° 78° 35° (1961) 96° (1921) 0.15" NA
May 24 54° 79° 38° (1925) 96° (1921) 0.14" NA
May 25 55° 79° 29° (1925) 95° (1926) 0.14" NA
May 26 55° 79° 31° (1979) 94° (1911) 0.14" NA
May 27 55° 80° 34° (1961) 96° (1911) 0.14" NA
May 28 55° 80° 36° (1907) 94° (1911) 0.14" NA
May 29 56° 80° 36° (1901) 96° (1934) 0.14" NA
May 30 56° 81° 36° (1924) 98° (1934) 0.14" NA
May 31 56° 81° 38° (1930) 101° (1934) 0.14" NA
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