River Forest, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 14° 30° -27° (1985) 67° (1950) 1.75" 11.3"
February 19° 35° -21° (1899) 75° (1976) 1.63" 8.3"
March 29° 46° -12° (1873) 88° (1986) 2.65" 6"
April 38° 58° 7° (1982) 91° (1980) 3.68" 1.6"
May 47° 70° 27° (1983) 98° (1934) 3.38" 0"
June 57° 79° 35° (1945) 104° (1988) 3.63" 0"
July 63° 84° 45° (1983) 105° (1934) 3.51" 0"
August 62° 81° 42° (1986) 102° (1918) 4.62" 0"
September 54° 74° 29° (1995) 101° (1953) 3.27" 0"
October 42° 62° 14° (1887) 94° (1963) 2.71" 0.3"
November 32° 47° -2° (1950) 81° (1950) 3.01" 1.8"
December 20° 34° -25° (1983) 71° (1982) 2.43" 8.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 59° 78° 45° (1949) 101° (1953) 0.14" NA
Sep 2 58° 78° 44° (1946) 101° (1953) 0.13" NA
Sep 3 58° 78° 47° (1974) 97° (1953) 0.13" NA
Sep 4 58° 77° 45° (1997) 95° (1983) 0.13" NA
Sep 5 57° 77° 44° (1988) 98° (1899) 0.13" NA
Sep 6 57° 77° 42° (1984) 97° (1960) 0.13" NA
Sep 7 57° 77° 42° (1986) 100° (1960) 0.12" NA
Sep 8 57° 76° 43° (1986) 96° (1960) 0.12" NA
Sep 9 56° 76° 43° (1986) 95° (1983) 0.12" NA
Sep 10 56° 76° 44° (1943) 95° (1983) 0.12" NA
Sep 11 55° 75° 42° (1993) 95° (1952) 0.11" NA
Sep 12 55° 75° 44° (1955) 96° (1952) 0.11" NA
Sep 13 55° 75° 39° (1890) 98° (1939) 0.11" NA
Sep 14 54° 75° 40° (1985) 99° (1939) 0.11" NA
Sep 15 54° 74° 39° (2007) 99° (1939) 0.11" NA
Sep 16 54° 74° 37° (1984) 92° (1955) 0.11" NA
Sep 17 53° 74° 37° (1984) 93° (1955) 0.1" NA
Sep 18 53° 73° 40° (1903) 94° (1955) 0.1" NA
Sep 19 53° 73° 40° (1991) 93° (1955) 0.1" NA
Sep 20 52° 73° 36° (1991) 91° (1931) 0.1" NA
Sep 21 52° 72° 39° (1991) 92° (1970) 0.1" NA
Sep 22 51° 72° 32° (1995) 92° (1956) 0.1" NA
Sep 23 51° 72° 29° (1995) 91° (1937) 0.1" NA
Sep 24 51° 71° 35° (1989) 91° (1891) 0.1" NA
Sep 25 50° 71° 30° (1942) 90° (1933) 0.09" NA
Sep 26 50° 70° 35° (1928) 90° (1998) 0.09" NA
Sep 27 49° 70° 31° (1942) 91° (1971) 0.09" NA
Sep 28 49° 70° 29° (1942) 92° (1953) 0.09" NA
Sep 29 49° 69° 32° (1984) 99° (1953) 0.09" NA
Sep 30 48° 69° 29° (1984) 92° (1971) 0.09" NA
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