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
Apr 1 31° 50° 23° (1987) 83° (1986) 0.09" NA
Apr 2 32° 51° 22° (1992) 72° (2003) 0.09" NA
Apr 3 32° 51° 18° (1987) 80° (1981) 0.09" NA
Apr 4 32° 52° 16° (1975) 72° (1981) 0.1" NA
Apr 5 33° 52° 16° (1975) 77° (2005) 0.1" NA
Apr 6 33° 53° 10° (1982) 80° (1988) 0.1" NA
Apr 7 33° 53° 9° (1982) 84° (1991) 0.1" NA
Apr 8 34° 54° 17° (1982) 78° (2001) 0.1" NA
Apr 9 34° 54° 18° (1997) 78° (1991) 0.1" NA
Apr 10 34° 54° 19° (1997) 75° (1987) 0.1" NA
Apr 11 35° 55° 21° (1989) 83° (1977) 0.1" NA
Apr 12 35° 55° 21° (1989) 82° (1977) 0.11" NA
Apr 13 35° 56° 23° (1989) 81° (1977) 0.11" NA
Apr 14 36° 56° 23° (1997) 81° (2006) 0.11" NA
Apr 15 36° 57° 24° (1989) 85° (2003) 0.11" NA
Apr 16 36° 57° 24° (1983) 87° (2002) 0.11" NA
Apr 17 37° 58° 23° (1983) 86° (1977) 0.11" NA
Apr 18 37° 58° 22° (1983) 86° (1976) 0.11" NA
Apr 19 37° 58° 22° (1983) 88° (2002) 0.11" NA
Apr 20 38° 59° 28° (1983) 86° (1985) 0.11" NA
Apr 21 38° 59° 27° (1988) 90° (1987) 0.11" NA
Apr 22 39° 60° 21° (1986) 87° (1985) 0.11" NA
Apr 23 39° 60° 26° (1986) 92° (1980) 0.11" NA
Apr 24 39° 60° 29° (1984) 83° (1990) 0.12" NA
Apr 25 40° 61° 32° (1981) 85° (1990) 0.12" NA
Apr 26 40° 61° 29° (1976) 91° (1986) 0.12" NA
Apr 27 40° 62° 29° (1976) 88° (1986) 0.12" NA
Apr 28 41° 62° 30° (1976) 86° (1986) 0.12" NA
Apr 29 41° 63° 28° (1977) 78° (2004) 0.12" NA
Apr 30 42° 63° 33° (1996) 84° (2007) 0.12" NA
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