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
Jun 1 53° 75° 38° (1993) 92° (1988) 0.15" NA
Jun 2 54° 75° 41° (1986) 91° (1988) 0.15" NA
Jun 3 54° 75° 40° (1986) 83° (2006) 0.15" NA
Jun 4 54° 76° 43° (1990) 85° (1979) 0.15" NA
Jun 5 55° 76° 39° (1993) 90° (1977) 0.15" NA
Jun 6 55° 76° 41° (1998) 89° (1981) 0.15" NA
Jun 7 55° 76° 42° (1998) 92° (2005) 0.15" NA
Jun 8 56° 77° 47° (1975) 91° (1988) 0.15" NA
Jun 9 56° 77° 41° (1977) 95° (1985) 0.15" NA
Jun 10 56° 77° 41° (1988) 90° (1999) 0.15" NA
Jun 11 56° 78° 44° (1980) 88° (1976) 0.16" NA
Jun 12 57° 78° 44° (1985) 94° (1976) 0.16" NA
Jun 13 57° 78° 44° (1985) 94° (1976) 0.16" NA
Jun 14 57° 78° 46° (1999) 96° (1976) 0.15" NA
Jun 15 57° 79° 50° (1977) 98° (1987) 0.15" NA
Jun 16 58° 79° 44° (1980) 93° (1994) 0.15" NA
Jun 17 58° 79° 46° (1980) 93° (1994) 0.15" NA
Jun 18 58° 79° 48° (1999) 94° (1987) 0.15" NA
Jun 19 58° 79° 48° (1982) 95° (1994) 0.15" NA
Jun 20 59° 80° 45° (1985) 93° (1986) 0.15" NA
Jun 21 59° 80° 40° (1992) 100° (1988) 0.15" NA
Jun 22 59° 80° 43° (1992) 99° (1988) 0.15" NA
Jun 23 59° 80° 43° (1992) 97° (1988) 0.15" NA
Jun 24 59° 80° 46° (1979) 95° (2005) 0.15" NA
Jun 25 60° 80° 44° (1979) 94° (2003) 0.14" NA
Jun 26 60° 81° 48° (1986) 98° (1988) 0.14" NA
Jun 27 60° 81° 47° (1992) 96° (1983) 0.14" NA
Jun 28 60° 81° 46° (1992) 91° (1977) 0.14" NA
Jun 29 60° 81° 47° (1989) 93° (1996) 0.14" NA
Jun 30 60° 81° 45° (1988) 94° (1996) 0.13" NA
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