Westport, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 21° 38° -26° (1994) 70° (2006) 2.7" 2.8"
February 24° 43° -11° (2004) 77° (2000) 2.55" 1.8"
March 33° 54° 0° (1993) 83° (2007) 3.65" 0.6"
April 44° 66° 20° (1990) 90° (1989) 4.31" 0.1"
May 54° 76° 30° (1994) 93° (2001) 5.93" 0"
June 63° 84° 38° (1992) 104° (1988) 4.19" 0"
July 66° 88° 49° (2001) 103° (1988) 4.64" 0"
August 64° 87° 44° (1986) 102° (1988) 3.41" 0"
September 56° 81° 26° (1995) 99° (2007) 3.37" 0"
October 45° 69° 24° (1992) 94° (2007) 3.77" 0"
November 35° 56° 11° (1995) 82° (2000) 4.19" 0"
December 25° 42° -21° (1989) 75° (1982) 3.42" 2.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 29° 47° 16° (2002) 67° (1982) 0.11" 0.1"
Dec 2 29° 47° 14° (1985) 67° (1982) 0.12" 0"
Dec 3 28° 46° 13° (1985) 75° (1982) 0.11" 0.1"
Dec 4 28° 46° 8° (1991) 69° (1998) 0.12" 0"
Dec 5 28° 45° 8° (1991) 72° (1998) 0.11" 0.1"
Dec 6 27° 45° 2° (2002) 75° (1982) 0.11" 0.1"
Dec 7 27° 45° 6° (2002) 74° (1998) 0.12" 0"
Dec 8 26° 44° 6° (2006) 63° (2004) 0.12" 0.1"
Dec 9 26° 44° -5° (1995) 64° (1991) 0.11" 0.1"
Dec 10 26° 43° -5° (1995) 59° (1999) 0.12" 0.1"
Dec 11 26° 43° 2° (1995) 63° (1996) 0.11" 0.1"
Dec 12 25° 43° 10° (1988) 68° (1996) 0.12" 0.1"
Dec 13 25° 42° 8° (1989) 63° (1991) 0.1" 0"
Dec 14 25° 42° 3° (1985) 62° (1984) 0.11" 0.1"
Dec 15 24° 42° 3° (1985) 69° (1984) 0.1" 0.1"
Dec 16 24° 41° -13° (1989) 61° (1984) 0.11" 0.1"
Dec 17 24° 41° -13° (1989) 66° (1984) 0.11" 0.1"
Dec 18 24° 41° -10° (1989) 68° (2006) 0.1" 0.1"
Dec 19 24° 40° -6° (1989) 61° (2002) 0.11" 0.1"
Dec 20 23° 40° -10° (1989) 62° (1988) 0.1" 0.1"
Dec 21 23° 40° -7° (1989) 61° (1988) 0.11" 0.1"
Dec 22 23° 40° -21° (1989) 58° (1984) 0.11" 0.1"
Dec 23 23° 40° -19° (1989) 63° (1994) 0.11" 0.1"
Dec 24 23° 39° -16° (1989) 59° (1988) 0.12" 0.1"
Dec 25 23° 39° -12° (2004) 62° (1982) 0.11" 0"
Dec 26 22° 39° -10° (1983) 62° (1982) 0.11" 0.1"
Dec 27 22° 39° 0° (2004) 55° (1994) 0.11" 0.1"
Dec 28 22° 39° 0° (2004) 68° (1996) 0.11" 0.1"
Dec 29 22° 39° 2° (1988) 66° (1984) 0.11" 0.1"
Dec 30 22° 38° 2° (1988) 68° (1984) 0.1" 0"
Dec 31 22° 38° 2° (1993) 59° (1992) 0.1" 0.1"
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