River Forest, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 16° 31° -27° (1985) 67° (1950) 1.73" 10.8"
February 20° 36° -21° (1899) 75° (1976) 1.87" 9.1"
March 29° 47° -12° (1873) 88° (1986) 2.5" 5.6"
April 39° 59° 7° (1982) 91° (1980) 3.38" 1.2"
May 48° 70° 27° (1983) 98° (1934) 3.68" 0"
June 58° 80° 35° (1945) 104° (1988) 3.45" 0"
July 64° 84° 45° (1983) 105° (1934) 3.7" 0"
August 63° 82° 42° (1986) 102° (1918) 4.9" 0"
September 54° 75° 29° (1995) 101° (1953) 3.21" 0"
October 43° 62° 14° (1887) 94° (1963) 3.15" 0.3"
November 32° 48° -2° (1950) 81° (1950) 3.15" 1.2"
December 21° 35° -25° (1983) 71° (1982) 2.25" 8.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 26° 40° -6° (1893) 68° (1970) 0.09" 0.2"
Dec 2 25° 40° -1° (1942) 71° (1982) 0.1" 0.2"
Dec 3 25° 39° -5° (1940) 71° (1970) 0.09" 0.2"
Dec 4 24° 39° 0° (1893) 66° (1998) 0.09" 0.3"
Dec 5 24° 38° 4° (2005) 68° (2001) 0.09" 0.2"
Dec 6 24° 38° 0° (2007) 65° (1980) 0.08" 0.2"
Dec 7 23° 37° -6° (1882) 64° (1916) 0.09" 0.2"
Dec 8 23° 37° -7° (1882) 64° (1946) 0.09" 0.3"
Dec 9 22° 37° -14° (1876) 62° (1879) 0.08" 0.2"
Dec 10 22° 36° -8° (1978) 62° (1879) 0.08" 0.3"
Dec 11 22° 36° -5° (1972) 61° (1949) 0.09" 0.2"
Dec 12 21° 35° -8° (2000) 61° (1877) 0.07" 0.3"
Dec 13 21° 35° -13° (1903) 67° (1975) 0.08" 0.3"
Dec 14 21° 35° -9° (1901) 66° (1975) 0.07" 0.2"
Dec 15 21° 35° -12° (1901) 64° (1971) 0.07" 0.3"
Dec 16 20° 34° -12° (1951) 60° (1984) 0.07" 0.3"
Dec 17 20° 34° -7° (1951) 60° (1977) 0.06" 0.3"
Dec 18 20° 34° -11° (1983) 62° (1877) 0.06" 0.3"
Dec 19 20° 34° -14° (1983) 64° (1877) 0.07" 0.3"
Dec 20 19° 33° -9° (1963) 67° (1877) 0.06" 0.3"
Dec 21 19° 33° -14° (1989) 62° (1967) 0.07" 0.3"
Dec 22 19° 33° -21° (1872) 57° (1957) 0.06" 0.3"
Dec 23 19° 33° -21° (1983) 62° (1982) 0.06" 0.3"
Dec 24 19° 33° -25° (1983) 64° (1889) 0.06" 0.3"
Dec 25 18° 32° -17° (1983) 64° (1982) 0.06" 0.3"
Dec 26 18° 32° -11° (1983) 55° (1971) 0.06" 0.2"
Dec 27 18° 32° -10° (1950) 61° (2008) 0.06" 0.4"
Dec 28 18° 32° -13° (1924) 69° (1984) 0.06" 0.3"
Dec 29 18° 32° -15° (1880) 63° (1984) 0.06" 0.3"
Dec 30 18° 32° -7° (1909) 61° (1884) 0.06" 0.4"
Dec 31 17° 32° -10° (1967) 68° (1875) 0.06" 0.3"
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