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
Dec 1 24° 39° 11° (1963) 66° (1970) 0.1" 0.1"
Dec 2 23° 39° 0° (1976) 68° (1982) 0.09" 0.2"
Dec 3 23° 38° -5° (1976) 68° (1998) 0.1" 0.1"
Dec 4 23° 38° 0° (1991) 67° (1998) 0.09" 0.1"
Dec 5 22° 37° 3° (1976) 70° (2001) 0.09" 0.1"
Dec 6 22° 37° -3° (2007) 66° (2001) 0.09" 0.2"
Dec 7 21° 36° -4° (1972) 62° (1951) 0.09" 0.1"
Dec 8 21° 36° -1° (2005) 60° (1966) 0.09" 0.1"
Dec 9 21° 35° -15° (1958) 56° (1990) 0.09" 0.2"
Dec 10 20° 35° -8° (1958) 60° (1949) 0.08" 0.1"
Dec 11 20° 35° -16° (1972) 60° (1949) 0.09" 0.1"
Dec 12 20° 34° -9° (1962) 59° (1991) 0.09" 0.2"
Dec 13 19° 34° -8° (2000) 61° (1975) 0.08" 0.2"
Dec 14 19° 34° -6° (1985) 62° (1975) 0.07" 0.1"
Dec 15 19° 33° -11° (1951) 61° (1971) 0.08" 0.2"
Dec 16 19° 33° -15° (1951) 62° (1984) 0.07" 0.2"
Dec 17 18° 33° -10° (1951) 58° (1984) 0.07" 0.2"
Dec 18 18° 33° -9° (1985) 55° (2002) 0.07" 0.1"
Dec 19 18° 32° -15° (1983) 55° (1988) 0.07" 0.2"
Dec 20 18° 32° -12° (1963) 56° (1988) 0.07" 0.2"
Dec 21 17° 32° -15° (1989) 60° (1967) 0.07" 0.2"
Dec 22 17° 32° -16° (1989) 64° (1957) 0.07" 0.2"
Dec 23 17° 32° -17° (1960) 59° (1982) 0.06" 0.2"
Dec 24 17° 31° -21° (1983) 60° (1982) 0.07" 0.2"
Dec 25 17° 31° -14° (1983) 62° (1982) 0.06" 0.2"
Dec 26 16° 31° -8° (1962) 55° (1982) 0.06" 0.2"
Dec 27 16° 31° -16° (1950) 56° (1959) 0.07" 0.3"
Dec 28 16° 31° -6° (1961) 65° (1984) 0.06" 0.2"
Dec 29 16° 31° -9° (1976) 61° (1984) 0.06" 0.3"
Dec 30 16° 31° -10° (1983) 59° (2002) 0.07" 0.2"
Dec 31 16° 31° -13° (1976) 63° (1965) 0.06" 0.2"
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