DeKalb, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 13° 28° -27° (1985) 63° (1967) 1.48" 10.1"
February 17° 33° -23° (1996) 69° (2000) 1.61" 7.3"
March 27° 45° -13° (2002) 84° (1986) 2.27" 4.3"
April 38° 59° 8° (1982) 92° (1986) 3.27" 0.9"
May 49° 70° 24° (1989) 95° (1985) 4.57" 0"
June 59° 80° 34° (1993) 101° (1988) 4.14" 0"
July 63° 83° 43° (1967) 102° (1995) 4.37" 0"
August 61° 81° 39° (1986) 103° (1988) 4.36" 0"
September 52° 75° 27° (1991) 94° (1990) 3.25" 0"
October 40° 62° 13° (1988) 89° (2007) 2.88" 0.1"
November 30° 47° -8° (1976) 76° (2000) 2.7" 1.1"
December 17° 32° -22° (1983) 66° (1970) 2.15" 8.1"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 43° 65° 28° (1978) 84° (2001) 0.13" 0"
May 2 44° 66° 29° (1966) 90° (1992) 0.13" 0"
May 3 44° 66° 27° (2005) 83° (1968) 0.13" 0"
May 4 44° 66° 29° (2005) 86° (1980) 0.13" 0"
May 5 45° 67° 30° (1987) 87° (1980) 0.14" 0"
May 6 45° 67° 28° (1989) 85° (2000) 0.13" 0"
May 7 45° 67° 24° (1989) 86° (2004) 0.14" 0"
May 8 46° 68° 31° (1989) 86° (1979) 0.13" 0"
May 9 46° 68° 27° (1966) 86° (1979) 0.14" 0"
May 10 46° 68° 25° (1966) 87° (1993) 0.14" 0"
May 11 47° 69° 28° (1989) 88° (1987) 0.15" 0"
May 12 47° 69° 30° (1981) 89° (1987) 0.15" 0"
May 13 47° 69° 35° (1967) 87° (1982) 0.15" 0"
May 14 48° 70° 35° (1988) 88° (1982) 0.15" 0"
May 15 48° 70° 36° (1997) 90° (2007) 0.15" 0"
May 16 49° 70° 34° (1997) 89° (2001) 0.15" 0"
May 17 49° 71° 36° (1973) 88° (1977) 0.15" 0"
May 18 49° 71° 33° (2002) 90° (1987) 0.15" 0"
May 19 50° 71° 34° (2002) 94° (1975) 0.16" 0"
May 20 50° 72° 35° (1981) 94° (1975) 0.16" 0"
May 21 50° 72° 31° (2002) 89° (1972) 0.16" 0"
May 22 51° 72° 34° (2006) 91° (1975) 0.17" 0"
May 23 51° 73° 35° (1969) 91° (1975) 0.16" 0"
May 24 51° 73° 36° (1992) 91° (2010) 0.15" 0"
May 25 52° 73° 30° (1988) 92° (2010) 0.16" 0"
May 26 52° 74° 36° (1979) 95° (1985) 0.16" 0"
May 27 52° 74° 30° (1992) 93° (1985) 0.14" 0"
May 28 53° 74° 33° (1992) 90° (1969) 0.15" 0"
May 29 53° 75° 35° (1984) 93° (2006) 0.15" 0"
May 30 54° 75° 37° (1984) 93° (2006) 0.15" 0"
May 31 54° 75° 42° (1972) 91° (1994) 0.16" 0"
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