Rock Grove, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 25° -27° (1985) 61° (2002) 1.33" 8.3"
February 14° 31° -27° (1996) 65° (1999) 1.33" 6.8"
March 25° 43° -8° (2002) 85° (1986) 2.14" 6.4"
April 36° 57° 9° (1982) 92° (1980) 3.23" 2"
May 47° 69° 25° (2005) 95° (1985) 3.96" 0.1"
June 57° 78° 38° (1993) 100° (1988) 4.46" 0"
July 62° 82° 46° (1979) 101° (1988) 3.57" 0"
August 59° 80° 40° (1986) 101° (1988) 4.11" 0"
September 50° 73° 28° (1984) 96° (1985) 3.67" 0"
October 39° 61° 15° (1988) 90° (1997) 2.58" 0.1"
November 28° 44° -5° (1977) 77° (2000) 2.69" 2.2"
December 16° 30° -23° (2000) 67° (2001) 1.72" 8.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 55° 77° 45° (1994) 91° (2000) 0.14" NA
Sep 2 55° 76° 45° (1976) 95° (1984) 0.14" NA
Sep 3 55° 76° 43° (1974) 91° (1999) 0.14" NA
Sep 4 54° 76° 38° (1974) 91° (1983) 0.14" NA
Sep 5 54° 76° 41° (1974) 92° (1983) 0.13" NA
Sep 6 54° 75° 38° (1988) 91° (1998) 0.13" NA
Sep 7 53° 75° 39° (1986) 94° (1990) 0.13" NA
Sep 8 53° 75° 36° (1986) 96° (1985) 0.13" NA
Sep 9 52° 75° 38° (1986) 96° (1978) 0.13" NA
Sep 10 52° 74° 42° (1975) 94° (1978) 0.13" NA
Sep 11 52° 74° 40° (1993) 93° (1978) 0.13" NA
Sep 12 51° 74° 40° (1975) 90° (1978) 0.13" NA
Sep 13 51° 74° 34° (1975) 90° (1984) 0.13" NA
Sep 14 51° 73° 36° (1974) 87° (1994) 0.13" NA
Sep 15 50° 73° 35° (2007) 88° (1994) 0.13" NA
Sep 16 50° 73° 33° (1984) 89° (1994) 0.12" NA
Sep 17 50° 72° 34° (1984) 83° (1997) 0.12" NA
Sep 18 49° 72° 38° (1973) 90° (1988) 0.12" NA
Sep 19 49° 72° 39° (2003) 87° (1985) 0.12" NA
Sep 20 49° 71° 32° (1991) 90° (1978) 0.12" NA
Sep 21 48° 71° 33° (1991) 86° (1980) 0.12" NA
Sep 22 48° 71° 30° (1974) 88° (2007) 0.11" NA
Sep 23 47° 70° 28° (1974) 83° (1988) 0.11" NA
Sep 24 47° 70° 29° (1976) 84° (2007) 0.11" NA
Sep 25 47° 70° 30° (1976) 89° (1984) 0.11" NA
Sep 26 46° 69° 32° (1984) 89° (1998) 0.11" NA
Sep 27 46° 69° 30° (1991) 83° (1974) 0.11" NA
Sep 28 45° 69° 30° (1991) 86° (1990) 0.1" NA
Sep 29 45° 68° 28° (1984) 83° (1979) 0.1" NA
Sep 30 45° 68° 28° (1984) 86° (2002) 0.1" NA
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