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
Jul 1 61° 81° 47° (1988) 91° (2002) 0.13" NA
Jul 2 61° 82° 47° (1995) 93° (1975) 0.13" NA
Jul 3 61° 82° 48° (1995) 93° (1974) 0.13" NA
Jul 4 61° 82° 53° (1976) 93° (1974) 0.12" NA
Jul 5 61° 82° 48° (1979) 98° (1977) 0.12" NA
Jul 6 61° 82° 46° (1979) 97° (1977) 0.12" NA
Jul 7 61° 82° 47° (1983) 97° (1977) 0.12" NA
Jul 8 61° 82° 51° (1984) 97° (1980) 0.12" NA
Jul 9 61° 82° 54° (1995) 98° (1974) 0.12" NA
Jul 10 62° 82° 49° (1997) 97° (1974) 0.12" NA
Jul 11 62° 82° 49° (1975) 100° (1989) 0.11" NA
Jul 12 62° 82° 49° (1975) 97° (1976) 0.11" NA
Jul 13 62° 82° 49° (1975) 96° (1981) 0.11" NA
Jul 14 62° 82° 50° (1975) 100° (1995) 0.11" NA
Jul 15 62° 82° 53° (1991) 101° (1977) 0.11" NA
Jul 16 62° 82° 50° (1987) 101° (1988) 0.11" NA
Jul 17 62° 82° 48° (1976) 95° (2005) 0.11" NA
Jul 18 62° 82° 50° (1979) 94° (1986) 0.11" NA
Jul 19 62° 83° 53° (1979) 94° (1986) 0.11" NA
Jul 20 62° 82° 53° (2007) 97° (1977) 0.11" NA
Jul 21 62° 82° 53° (2007) 96° (1983) 0.11" NA
Jul 22 62° 82° 53° (2007) 96° (1983) 0.11" NA
Jul 23 62° 82° 49° (1985) 97° (1983) 0.11" NA
Jul 24 62° 82° 52° (2000) 99° (2005) 0.11" NA
Jul 25 62° 82° 53° (1991) 93° (1986) 0.11" NA
Jul 26 62° 82° 51° (1991) 95° (1987) 0.11" NA
Jul 27 62° 82° 53° (1991) 94° (1997) 0.11" NA
Jul 28 62° 82° 52° (1981) 94° (1988) 0.11" NA
Jul 29 62° 82° 48° (1981) 96° (1983) 0.12" NA
Jul 30 62° 82° 51° (1984) 95° (1999) 0.12" NA
Jul 31 62° 82° 50° (1997) 96° (1999) 0.12" NA
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