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
Apr 1 32° 53° 23° (1987) 83° (1986) 0.09" 0.1"
Apr 2 32° 54° 22° (1992) 82° (2010) 0.1" 0"
Apr 3 32° 54° 18° (1987) 80° (1981) 0.09" 0.1"
Apr 4 33° 55° 16° (1975) 72° (1981) 0.1" 0"
Apr 5 33° 55° 16° (1975) 77° (2005) 0.1" 0.1"
Apr 6 33° 55° 10° (1982) 80° (1988) 0.1" 0"
Apr 7 34° 56° 9° (1982) 84° (1991) 0.11" 0.1"
Apr 8 34° 56° 17° (1982) 78° (2001) 0.11" 0"
Apr 9 34° 57° 18° (1997) 78° (1991) 0.1" 0"
Apr 10 35° 57° 19° (1997) 75° (1987) 0.11" 0.1"
Apr 11 35° 58° 21° (1989) 83° (1977) 0.11" 0"
Apr 12 36° 58° 21° (1989) 82° (1977) 0.11" 0"
Apr 13 36° 59° 23° (1989) 81° (1977) 0.11" 0.1"
Apr 14 36° 59° 23° (1997) 81° (2006) 0.1" 0"
Apr 15 37° 59° 24° (1989) 85° (2003) 0.11" 0"
Apr 16 37° 60° 24° (1983) 87° (2002) 0.12" 0"
Apr 17 37° 60° 23° (1983) 86° (1977) 0.11" 0.1"
Apr 18 38° 61° 22° (1983) 86° (1976) 0.12" 0"
Apr 19 38° 61° 22° (1983) 88° (2002) 0.11" 0"
Apr 20 38° 62° 28° (1983) 86° (1985) 0.11" 0"
Apr 21 39° 62° 27° (1988) 90° (1987) 0.12" 0.1"
Apr 22 39° 62° 21° (1986) 87° (1985) 0.11" 0"
Apr 23 40° 63° 26° (1986) 92° (1980) 0.11" 0"
Apr 24 40° 63° 29° (1984) 83° (1990) 0.12" 0"
Apr 25 40° 64° 32° (1981) 85° (1990) 0.11" 0"
Apr 26 41° 64° 29° (1976) 91° (1986) 0.12" 0"
Apr 27 41° 64° 29° (1976) 88° (1986) 0.12" 0"
Apr 28 41° 65° 30° (1976) 86° (1986) 0.12" 0"
Apr 29 42° 65° 28° (1977) 78° (2004) 0.12" 0"
Apr 30 42° 65° 33° (1996) 84° (2007) 0.13" 0"
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