Bethalto, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 19° 36° -16° (1982) 72° (1950) 1.99" 5.1"
February 24° 42° -15° (1996) 76° (2000) 2.3" 4.4"
March 34° 52° -1° (1960) 85° (1986) 3.47" 3.4"
April 45° 64° 20° (1982) 92° (1952) 4.16" 0.4"
May 55° 75° 32° (1966) 98° (1953) 4.24" 0"
June 64° 84° 44° (1998) 107° (1952) 3.22" 0"
July 69° 88° 50° (1972) 111° (1954) 3.49" 0"
August 66° 86° 46° (1986) 106° (1953) 3.17" 0"
September 58° 79° 37° (1974) 103° (1954) 3.14" 0"
October 46° 68° 25° (1981) 97° (2006) 2.7" 0"
November 35° 53° 4° (1964) 84° (1950) 3.75" 0.6"
December 25° 41° -16° (1989) 73° (1984) 2.91" 1.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 50° 70° 37° (1978) 94° (1953) 0.15" NA
May 2 50° 70° 36° (1966) 94° (1952) 0.15" NA
May 3 51° 70° 34° (1954) 90° (1949) 0.15" NA
May 4 51° 71° 34° (1957) 96° (1952) 0.15" NA
May 5 51° 71° 38° (1957) 92° (1952) 0.14" NA
May 6 52° 71° 37° (1958) 92° (1949) 0.14" NA
May 7 52° 72° 38° (1976) 89° (2004) 0.14" NA
May 8 52° 72° 41° (1976) 88° (1986) 0.14" NA
May 9 53° 72° 35° (1966) 89° (1986) 0.14" NA
May 10 53° 73° 32° (1966) 87° (1963) 0.14" NA
May 11 53° 73° 40° (1949) 85° (1956) 0.14" NA
May 12 54° 73° 39° (1960) 86° (1962) 0.14" NA
May 13 54° 74° 39° (1971) 90° (1956) 0.14" NA
May 14 54° 74° 40° (1953) 92° (1949) 0.14" NA
May 15 55° 74° 43° (1959) 89° (1968) 0.14" NA
May 16 55° 75° 42° (1983) 90° (1951) 0.14" NA
May 17 55° 75° 42° (1983) 92° (1951) 0.14" NA
May 18 56° 75° 41° (2002) 91° (1964) 0.14" NA
May 19 56° 76° 41° (2002) 91° (1996) 0.14" NA
May 20 56° 76° 43° (1954) 91° (1962) 0.14" NA
May 21 57° 76° 43° (2002) 92° (1962) 0.13" NA
May 22 57° 77° 43° (2002) 93° (1987) 0.13" NA
May 23 57° 77° 43° (1963) 91° (1950) 0.13" NA
May 24 58° 77° 45° (1956) 96° (1953) 0.13" NA
May 25 58° 78° 44° (1949) 92° (1953) 0.13" NA
May 26 58° 78° 41° (1961) 98° (1953) 0.13" NA
May 27 59° 78° 44° (1961) 92° (1977) 0.13" NA
May 28 59° 78° 46° (1992) 91° (1972) 0.13" NA
May 29 59° 79° 41° (1984) 94° (1953) 0.12" NA
May 30 60° 79° 41° (1984) 91° (1991) 0.12" NA
May 31 60° 79° 42° (1972) 93° (1953) 0.12" NA
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