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
Oct 1 44° 67° 25° (2003) 87° (1982) 0.1" NA
Oct 2 44° 67° 25° (1974) 87° (1976) 0.1" NA
Oct 3 43° 67° 23° (1974) 86° (1983) 0.09" NA
Oct 4 43° 66° 27° (1989) 90° (1997) 0.09" NA
Oct 5 43° 66° 27° (1980) 82° (2007) 0.09" NA
Oct 6 42° 66° 25° (2004) 86° (1997) 0.09" NA
Oct 7 42° 65° 27° (2001) 87° (2007) 0.09" NA
Oct 8 41° 65° 24° (1987) 87° (2007) 0.09" NA
Oct 9 41° 64° 24° (1987) 83° (2007) 0.08" NA
Oct 10 41° 64° 27° (2000) 82° (1973) 0.08" NA
Oct 11 40° 63° 24° (1987) 78° (2003) 0.08" NA
Oct 12 40° 63° 24° (1987) 80° (1973) 0.08" NA
Oct 13 39° 62° 24° (1988) 82° (1995) 0.08" NA
Oct 14 39° 62° 24° (1988) 88° (1975) 0.08" NA
Oct 15 39° 62° 25° (2006) 81° (1975) 0.08" NA
Oct 16 38° 61° 26° (1991) 82° (1989) 0.08" NA
Oct 17 38° 61° 25° (1992) 73° (1994) 0.08" NA
Oct 18 38° 60° 23° (1976) 77° (1995) 0.08" NA
Oct 19 37° 60° 20° (1992) 73° (2003) 0.08" NA
Oct 20 37° 59° 20° (1992) 81° (2003) 0.08" NA
Oct 21 37° 59° 27° (1974) 82° (2003) 0.08" NA
Oct 22 36° 58° 25° (1976) 82° (1979) 0.08" NA
Oct 23 36° 58° 24° (1999) 80° (1975) 0.08" NA
Oct 24 36° 57° 20° (1981) 78° (1975) 0.08" NA
Oct 25 35° 56° 23° (1987) 79° (1973) 0.08" NA
Oct 26 35° 56° 22° (1979) 78° (1989) 0.08" NA
Oct 27 35° 55° 23° (1976) 75° (1989) 0.08" NA
Oct 28 34° 55° 20° (1976) 73° (1989) 0.08" NA
Oct 29 34° 54° 20° (1980) 76° (1999) 0.08" NA
Oct 30 34° 54° 15° (1988) 78° (2004) 0.08" NA
Oct 31 33° 53° 17° (1988) 74° (1981) 0.08" NA
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