Naperville, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 14° 32° -26° (1985) 65° (1989) 1.85" NA
February 19° 38° -21° (1977) 74° (2000) 1.56" NA
March 28° 50° -10° (1962) 85° (1986) 2.62" NA
April 38° 63° 4° (1982) 90° (2002) 3.8" NA
May 48° 75° 25° (1966) 95° (1967) 3.94" NA
June 57° 84° 32° (1972) 103° (1988) 3.91" NA
July 63° 87° 41° (1967) 105° (1995) 3.97" NA
August 61° 85° 38° (1963) 100° (1991) 4.6" NA
September 53° 78° 27° (1974) 100° (1953) 3.38" NA
October 42° 67° 14° (1988) 90° (1971) 2.66" NA
November 32° 50° -4° (1950) 78° (1978) 3.2" NA
December 20° 37° -21° (1983) 70° (2001) 2.45" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 58° 82° 39° (1967) 100° (1953) 0.14" NA
Sep 2 58° 82° 40° (1967) 99° (1953) 0.13" NA
Sep 3 58° 82° 41° (1974) 96° (1953) 0.13" NA
Sep 4 57° 82° 39° (1963) 95° (1960) 0.13" NA
Sep 5 57° 81° 38° (1974) 95° (1999) 0.13" NA
Sep 6 57° 81° 41° (1988) 96° (1990) 0.13" NA
Sep 7 56° 81° 40° (1956) 97° (1960) 0.13" NA
Sep 8 56° 81° 38° (1986) 97° (1978) 0.12" NA
Sep 9 56° 80° 40° (1975) 95° (1978) 0.12" NA
Sep 10 55° 80° 40° (1969) 94° (1978) 0.12" NA
Sep 11 55° 80° 39° (1993) 92° (1978) 0.12" NA
Sep 12 55° 80° 40° (1955) 93° (1952) 0.12" NA
Sep 13 54° 79° 33° (1975) 93° (1998) 0.12" NA
Sep 14 54° 79° 34° (1975) 93° (1998) 0.11" NA
Sep 15 54° 79° 40° (1953) 90° (1971) 0.11" NA
Sep 16 53° 78° 35° (1984) 93° (1955) 0.11" NA
Sep 17 53° 78° 37° (1984) 91° (1988) 0.11" NA
Sep 18 53° 78° 36° (1959) 90° (1988) 0.11" NA
Sep 19 52° 78° 38° (1973) 92° (1978) 0.11" NA
Sep 20 52° 77° 31° (1956) 90° (1978) 0.11" NA
Sep 21 52° 77° 35° (1971) 90° (1970) 0.1" NA
Sep 22 51° 77° 30° (1976) 89° (1986) 0.1" NA
Sep 23 51° 76° 27° (1974) 87° (1986) 0.1" NA
Sep 24 50° 76° 28° (1995) 86° (1984) 0.1" NA
Sep 25 50° 76° 35° (1989) 89° (1986) 0.1" NA
Sep 26 50° 75° 35° (1966) 92° (1998) 0.1" NA
Sep 27 49° 75° 31° (1991) 92° (1998) 0.1" NA
Sep 28 49° 74° 34° (1991) 88° (1952) 0.09" NA
Sep 29 49° 74° 32° (1984) 96° (1953) 0.09" NA
Sep 30 48° 74° 30° (1984) 92° (1953) 0.09" NA
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