Rock Grove, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 11° 28° -27° (1985) 61° (2002) 1.37" 9"
February 16° 34° -27° (1996) 65° (1999) 1.58" 6.5"
March 26° 46° -8° (2002) 85° (1986) 2.08" 3.5"
April 37° 60° 9° (1982) 92° (1980) 3.3" 0.8"
May 48° 71° 25° (2005) 95° (1985) 3.99" 0"
June 58° 80° 38° (1993) 100° (1988) 4.61" 0"
July 62° 84° 46° (1979) 101° (1988) 3.94" 0"
August 60° 82° 40° (1986) 101° (1988) 4.29" 0"
September 50° 74° 28° (1984) 96° (1985) 3.66" 0"
October 39° 62° 15° (1988) 90° (1997) 2.88" 0"
November 29° 47° -5° (1977) 77° (2000) 2.66" 1.8"
December 16° 32° -23° (2000) 67° (2001) 1.76" 9.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 56° 79° 44° (2009) 91° (2000) 0.12" 0"
Sep 2 56° 79° 45° (1976) 95° (1984) 0.12" 0"
Sep 3 56° 79° 43° (1974) 91° (1999) 0.11" 0"
Sep 4 55° 79° 38° (1974) 91° (1983) 0.11" 0"
Sep 5 55° 78° 41° (1974) 92° (1983) 0.11" 0"
Sep 6 55° 78° 38° (1988) 91° (1998) 0.12" 0"
Sep 7 54° 78° 39° (1986) 94° (1990) 0.12" 0"
Sep 8 54° 77° 36° (1986) 96° (1985) 0.12" 0"
Sep 9 53° 77° 38° (1986) 96° (1978) 0.13" 0"
Sep 10 53° 77° 42° (1975) 94° (1978) 0.12" 0"
Sep 11 53° 76° 40° (1993) 93° (1978) 0.12" 0"
Sep 12 52° 76° 40° (1975) 90° (1978) 0.12" 0"
Sep 13 52° 76° 34° (1975) 90° (1984) 0.12" 0"
Sep 14 51° 75° 36° (1974) 88° (2005) 0.12" 0"
Sep 15 51° 75° 35° (2007) 88° (1994) 0.13" 0"
Sep 16 50° 74° 33° (1984) 89° (1994) 0.12" 0"
Sep 17 50° 74° 34° (1984) 83° (1997) 0.13" 0"
Sep 18 49° 74° 38° (1973) 90° (1988) 0.12" 0"
Sep 19 49° 73° 39° (2003) 87° (1985) 0.13" 0"
Sep 20 48° 73° 32° (1991) 90° (1978) 0.13" 0"
Sep 21 48° 72° 33° (1991) 86° (1980) 0.12" 0"
Sep 22 47° 72° 30° (1974) 88° (2007) 0.14" 0"
Sep 23 47° 72° 28° (1974) 84° (2005) 0.13" 0"
Sep 24 46° 71° 29° (1976) 88° (2010) 0.12" 0"
Sep 25 46° 71° 30° (1976) 89° (1984) 0.13" 0"
Sep 26 46° 70° 32° (1984) 89° (1998) 0.13" 0"
Sep 27 45° 70° 30° (1991) 83° (1974) 0.12" 0"
Sep 28 45° 69° 30° (1991) 86° (1990) 0.12" 0"
Sep 29 44° 69° 28° (1984) 83° (1979) 0.12" 0"
Sep 30 44° 69° 28° (1984) 86° (2002) 0.11" 0"
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