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
Aug 1 62° 82° 51° (1985) 97° (1988) 0.12" NA
Aug 2 61° 82° 48° (1985) 100° (1988) 0.12" NA
Aug 3 61° 82° 48° (1976) 97° (1988) 0.12" NA
Aug 4 61° 81° 47° (1978) 98° (1988) 0.12" NA
Aug 5 61° 81° 47° (1994) 98° (1988) 0.12" NA
Aug 6 61° 81° 48° (1994) 91° (2001) 0.12" NA
Aug 7 61° 81° 48° (1976) 95° (2001) 0.13" NA
Aug 8 61° 81° 46° (1976) 95° (1984) 0.13" NA
Aug 9 61° 81° 49° (1976) 97° (1983) 0.13" NA
Aug 10 60° 81° 52° (1982) 92° (1992) 0.13" NA
Aug 11 60° 81° 48° (1982) 94° (1983) 0.13" NA
Aug 12 60° 81° 47° (1977) 94° (1988) 0.13" NA
Aug 13 60° 80° 48° (2004) 94° (1988) 0.13" NA
Aug 14 60° 80° 47° (2004) 92° (1995) 0.13" NA
Aug 15 60° 80° 45° (1979) 96° (1988) 0.13" NA
Aug 16 59° 80° 44° (1976) 98° (1988) 0.13" NA
Aug 17 59° 80° 44° (1976) 101° (1988) 0.13" NA
Aug 18 59° 80° 47° (1981) 101° (1988) 0.14" NA
Aug 19 59° 79° 48° (1981) 94° (1983) 0.14" NA
Aug 20 59° 79° 47° (1985) 100° (1983) 0.14" NA
Aug 21 58° 79° 45° (1985) 95° (1983) 0.14" NA
Aug 22 58° 79° 47° (1985) 93° (1975) 0.14" NA
Aug 23 58° 79° 50° (1984) 92° (1976) 0.14" NA
Aug 24 58° 78° 44° (1984) 92° (1975) 0.14" NA
Aug 25 57° 78° 46° (1977) 93° (2003) 0.14" NA
Aug 26 57° 78° 49° (1977) 95° (2003) 0.14" NA
Aug 27 57° 78° 51° (1985) 93° (1973) 0.14" NA
Aug 28 56° 78° 40° (1986) 94° (1973) 0.14" NA
Aug 29 56° 77° 42° (1986) 97° (1984) 0.14" NA
Aug 30 56° 77° 42° (1986) 99° (1984) 0.14" NA
Aug 31 56° 77° 47° (1984) 92° (1973) 0.14" NA
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