Naperville, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 15° 30° -26° (1985) 65° (1989) 1.91" 9.6"
February 18° 35° -21° (1977) 74° (2000) 1.93" 8"
March 27° 47° -10° (1962) 85° (1986) 2.46" 3.7"
April 37° 60° 4° (1982) 90° (2002) 3.55" 0.6"
May 46° 71° 25° (1966) 95° (1967) 4.07" 0"
June 56° 80° 32° (1972) 103° (1988) 4.18" 0"
July 61° 83° 41° (1967) 105° (1995) 4.13" 0"
August 60° 81° 38° (1963) 100° (1991) 4.34" 0"
September 51° 75° 27° (1974) 100° (1953) 3.43" 0"
October 40° 63° 14° (1988) 90° (1971) 3.14" 0"
November 30° 48° -4° (1950) 78° (1978) 3.34" 0.7"
December 19° 34° -21° (1983) 70° (2001) 2.38" 5.4"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 57° 80° 39° (1967) 100° (1953) 0.11" 0"
Sep 2 57° 79° 40° (1967) 99° (1953) 0.11" 0"
Sep 3 57° 79° 41° (1974) 96° (1953) 0.12" 0"
Sep 4 56° 79° 39° (1963) 95° (1960) 0.1" 0"
Sep 5 56° 79° 38° (1974) 95° (1999) 0.11" 0"
Sep 6 56° 78° 41° (1988) 96° (1990) 0.11" 0"
Sep 7 55° 78° 40° (1956) 97° (1960) 0.11" 0"
Sep 8 55° 78° 38° (1986) 97° (1978) 0.11" 0"
Sep 9 54° 77° 40° (1975) 95° (1978) 0.11" 0"
Sep 10 54° 77° 39° (2008) 94° (1978) 0.11" 0"
Sep 11 54° 77° 39° (1993) 92° (1978) 0.1" 0"
Sep 12 53° 76° 40° (1955) 93° (1952) 0.1" 0"
Sep 13 53° 76° 33° (1975) 93° (1998) 0.11" 0"
Sep 14 52° 76° 34° (1975) 93° (1998) 0.12" 0"
Sep 15 52° 75° 40° (1953) 90° (1971) 0.11" 0"
Sep 16 51° 75° 35° (1984) 93° (1955) 0.11" 0"
Sep 17 51° 75° 37° (1984) 91° (1988) 0.11" 0"
Sep 18 50° 74° 36° (1959) 90° (1988) 0.11" 0"
Sep 19 50° 74° 38° (1973) 92° (1978) 0.12" 0"
Sep 20 50° 73° 31° (1956) 90° (1978) 0.13" 0"
Sep 21 49° 73° 35° (1971) 90° (1970) 0.13" 0"
Sep 22 49° 72° 30° (1976) 89° (1986) 0.13" 0"
Sep 23 48° 72° 27° (1974) 87° (1986) 0.12" 0"
Sep 24 48° 72° 28° (1995) 86° (1984) 0.12" 0"
Sep 25 47° 71° 35° (1989) 91° (2007) 0.12" 0"
Sep 26 47° 71° 35° (1966) 92° (1998) 0.13" 0"
Sep 27 46° 70° 31° (1991) 92° (1998) 0.12" 0"
Sep 28 46° 70° 34° (1991) 88° (1952) 0.11" 0"
Sep 29 46° 70° 32° (1984) 96° (1953) 0.11" 0"
Sep 30 45° 69° 30° (1984) 92° (1953) 0.12" 0"
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