Great Lakes, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 12° 28° -27° (1985) 64° (1989) 1.6" NA
February 17° 33° -22° (1996) 71° (2000) 1.4" NA
March 26° 43° -12° (1962) 81° (1986) 2.15" NA
April 36° 55° 8° (1982) 90° (1980) 3.73" NA
May 46° 67° 24° (1966) 93° (1987) 3.44" NA
June 55° 77° 34° (1992) 101° (1988) 3.62" NA
July 61° 82° 45° (2001) 102° (1995) 3.49" NA
August 61° 80° 40° (1986) 102° (1988) 4.22" NA
September 52° 73° 29° (1974) 100° (1953) 3.4" NA
October 41° 62° 18° (1981) 90° (1963) 2.42" NA
November 30° 47° -5° (1950) 79° (1950) 2.57" NA
December 18° 34° -23° (1983) 69° (2001) 2.05" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 41° 61° 27° (1963) 86° (2001) 0.12" NA
May 2 41° 61° 28° (1979) 90° (1959) 0.12" NA
May 3 41° 62° 29° (1981) 88° (1949) 0.12" NA
May 4 42° 62° 29° (1954) 90° (1952) 0.12" NA
May 5 42° 62° 31° (1968) 91° (1949) 0.11" NA
May 6 42° 63° 29° (1989) 87° (1980) 0.11" NA
May 7 43° 63° 29° (1989) 86° (2000) 0.11" NA
May 8 43° 64° 29° (1989) 88° (1963) 0.11" NA
May 9 43° 64° 30° (1966) 87° (1979) 0.11" NA
May 10 44° 64° 24° (1966) 86° (1987) 0.11" NA
May 11 44° 65° 30° (1949) 87° (1987) 0.11" NA
May 12 44° 65° 29° (1981) 87° (1956) 0.11" NA
May 13 45° 66° 29° (1981) 86° (1961) 0.11" NA
May 14 45° 66° 35° (1964) 87° (1991) 0.11" NA
May 15 46° 66° 34° (1953) 87° (1962) 0.11" NA
May 16 46° 67° 33° (1997) 89° (2001) 0.11" NA
May 17 46° 67° 33° (1997) 91° (1962) 0.11" NA
May 18 47° 68° 32° (2002) 90° (1964) 0.11" NA
May 19 47° 68° 36° (1993) 90° (1962) 0.1" NA
May 20 47° 68° 37° (1954) 92° (1975) 0.11" NA
May 21 48° 69° 29° (2002) 87° (1987) 0.11" NA
May 22 48° 69° 32° (2002) 92° (1956) 0.11" NA
May 23 48° 69° 34° (1963) 88° (1964) 0.11" NA
May 24 49° 70° 32° (1956) 91° (1950) 0.11" NA
May 25 49° 70° 32° (1992) 85° (1950) 0.11" NA
May 26 49° 71° 33° (1949) 85° (1987) 0.11" NA
May 27 49° 71° 33° (1992) 88° (1985) 0.11" NA
May 28 50° 71° 33° (1994) 91° (1969) 0.11" NA
May 29 50° 72° 34° (1966) 92° (1991) 0.11" NA
May 30 50° 72° 36° (1996) 93° (1987) 0.11" NA
May 31 51° 72° 36° (1996) 91° (1988) 0.11" NA
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