Alton, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 23° 40° -16° (1982) 72° (1950) 2.42" 5.1"
February 27° 44° -15° (1996) 76° (2000) 2.67" 4.4"
March 36° 55° -1° (1960) 85° (1986) 3.18" 3.4"
April 47° 67° 20° (1982) 92° (1952) 4.25" 0.4"
May 57° 76° 32° (1966) 98° (1953) 5.12" 0"
June 66° 85° 44° (1998) 107° (1952) 3.48" 0"
July 71° 89° 50° (1972) 111° (1954) 3.64" 0"
August 69° 88° 46° (1986) 106° (1953) 3.15" 0"
September 61° 81° 37° (1974) 103° (1954) 3.3" 0"
October 49° 69° 25° (1981) 97° (2006) 3.29" 0"
November 39° 56° 4° (1964) 84° (1950) 3.91" 0.6"
December 27° 43° -16° (1989) 73° (1984) 2.98" 1.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 52° 72° 37° (1978) 94° (1953) 0.16" NA
May 2 52° 72° 36° (1966) 94° (1952) 0.17" NA
May 3 53° 73° 34° (1954) 90° (1949) 0.17" NA
May 4 53° 73° 34° (1957) 96° (1952) 0.18" NA
May 5 53° 73° 38° (1957) 92° (1952) 0.17" NA
May 6 54° 73° 37° (1958) 92° (1949) 0.17" NA
May 7 54° 74° 38° (1976) 89° (2004) 0.17" NA
May 8 54° 74° 41° (1976) 88° (1986) 0.16" NA
May 9 55° 74° 35° (1966) 89° (1986) 0.17" NA
May 10 55° 74° 32° (1966) 87° (1963) 0.16" NA
May 11 55° 75° 40° (1949) 85° (1956) 0.16" NA
May 12 56° 75° 39° (1960) 86° (1962) 0.18" NA
May 13 56° 75° 39° (1971) 90° (1956) 0.17" NA
May 14 56° 75° 40° (1953) 92° (1949) 0.17" NA
May 15 57° 76° 43° (1959) 89° (1968) 0.17" NA
May 16 57° 76° 42° (1983) 90° (1951) 0.17" NA
May 17 57° 76° 42° (1983) 92° (1951) 0.16" NA
May 18 57° 76° 41° (2002) 91° (1964) 0.17" NA
May 19 58° 77° 41° (2002) 91° (1996) 0.16" NA
May 20 58° 77° 43° (1954) 91° (1962) 0.16" NA
May 21 58° 77° 43° (2002) 92° (1962) 0.17" NA
May 22 59° 77° 43° (2002) 93° (1987) 0.16" NA
May 23 59° 78° 43° (1963) 91° (1950) 0.16" NA
May 24 59° 78° 45° (1956) 96° (1953) 0.16" NA
May 25 60° 78° 44° (1949) 92° (1953) 0.16" NA
May 26 60° 79° 41° (1961) 98° (1953) 0.16" NA
May 27 60° 79° 44° (1961) 92° (1977) 0.17" NA
May 28 61° 79° 46° (1992) 91° (1972) 0.16" NA
May 29 61° 80° 41° (1984) 94° (1953) 0.16" NA
May 30 61° 80° 41° (1984) 91° (1991) 0.15" NA
May 31 62° 80° 42° (1972) 93° (1953) 0.16" NA
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