Grafton, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 19° 37° -25° (1977) 74° (1950) 2.17" 3.9"
February 23° 42° -22° (1982) 80° (1972) 2.34" 3.4"
March 32° 53° -11° (1960) 86° (1985) 3.24" 1.6"
April 42° 65° 18° (1961) 92° (1951) 3.88" 0.1"
May 53° 75° 28° (1976) 96° (1953) 4.61" 0"
June 62° 83° 37° (1972) 104° (1954) 3.84" 0"
July 66° 87° 43° (1962) 112° (1954) 3.62" 0"
August 63° 86° 38° (1986) 105° (1964) 3.17" 0"
September 54° 79° 27° (1983) 102° (1954) 3.41" 0"
October 43° 67° 17° (1981) 93° (1963) 3.21" 0.1"
November 34° 54° -2° (1991) 84° (1950) 4.08" 0.6"
December 22° 40° -19° (1989) 74° (1948) 3.12" 3.6"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Apr 1 37° 60° 21° (1954) 84° (2010) 0.13" 0"
Apr 2 38° 60° 18° (1961) 85° (2010) 0.12" 0"
Apr 3 38° 60° 20° (1962) 82° (1981) 0.12" 0"
Apr 4 38° 61° 23° (1987) 80° (1978) 0.11" 0"
Apr 5 39° 61° 24° (1970) 86° (1954) 0.12" 0.1"
Apr 6 39° 62° 21° (1982) 88° (1988) 0.12" 0"
Apr 7 39° 62° 20° (1990) 86° (1954) 0.13" 0"
Apr 8 40° 63° 21° (2007) 85° (2001) 0.12" 0"
Apr 9 40° 63° 21° (1997) 86° (2001) 0.12" 0"
Apr 10 40° 63° 20° (1960) 88° (2001) 0.13" 0"
Apr 11 41° 64° 21° (1973) 85° (1965) 0.12" 0"
Apr 12 41° 64° 22° (1957) 86° (1971) 0.12" 0"
Apr 13 41° 64° 23° (1950) 83° (1971) 0.12" 0"
Apr 14 42° 65° 24° (1997) 85° (1954) 0.12" 0"
Apr 15 42° 65° 24° (1962) 90° (2006) 0.13" 0"
Apr 16 42° 66° 21° (1962) 88° (2002) 0.12" 0"
Apr 17 43° 66° 28° (1951) 89° (2002) 0.13" 0"
Apr 18 43° 66° 25° (1983) 87° (2002) 0.13" 0"
Apr 19 44° 67° 24° (1983) 90° (2002) 0.13" 0"
Apr 20 44° 67° 25° (1983) 86° (2002) 0.13" 0"
Apr 21 44° 67° 29° (1982) 88° (1987) 0.14" 0"
Apr 22 45° 68° 27° (1959) 88° (1963) 0.13" 0"
Apr 23 45° 68° 26° (1956) 89° (1965) 0.15" 0"
Apr 24 45° 68° 27° (1967) 86° (1950) 0.14" 0"
Apr 25 46° 69° 29° (1968) 88° (2009) 0.14" 0"
Apr 26 46° 69° 30° (1976) 91° (1986) 0.14" 0"
Apr 27 46° 69° 31° (1968) 90° (1986) 0.14" 0"
Apr 28 47° 70° 30° (1992) 92° (1951) 0.14" 0"
Apr 29 47° 70° 29° (2008) 90° (1951) 0.15" 0"
Apr 30 48° 70° 34° (1976) 90° (1987) 0.14" 0"
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