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
Aug 1 61° 83° 51° (1985) 97° (1988) 0.15" 0"
Aug 2 61° 83° 48° (1985) 100° (1988) 0.15" 0"
Aug 3 61° 83° 48° (1976) 97° (1988) 0.14" 0"
Aug 4 61° 82° 47° (1978) 98° (1988) 0.15" 0"
Aug 5 61° 82° 47° (1994) 98° (1988) 0.15" 0"
Aug 6 61° 82° 48° (1994) 91° (2001) 0.15" 0"
Aug 7 61° 82° 48° (1976) 95° (2001) 0.15" 0"
Aug 8 61° 82° 46° (1976) 95° (1984) 0.13" 0"
Aug 9 61° 82° 49° (1976) 97° (1983) 0.14" 0"
Aug 10 61° 82° 52° (1982) 92° (1992) 0.14" 0"
Aug 11 60° 82° 48° (1982) 94° (1983) 0.14" 0"
Aug 12 60° 82° 47° (1977) 94° (1988) 0.15" 0"
Aug 13 60° 82° 48° (2004) 94° (1988) 0.15" 0"
Aug 14 60° 82° 47° (2004) 92° (1995) 0.14" 0"
Aug 15 60° 82° 45° (1979) 96° (1988) 0.15" 0"
Aug 16 60° 82° 44° (1976) 98° (1988) 0.15" 0"
Aug 17 60° 82° 44° (1976) 101° (1988) 0.15" 0"
Aug 18 60° 82° 47° (1981) 101° (1988) 0.15" 0"
Aug 19 59° 82° 48° (1981) 94° (1983) 0.14" 0"
Aug 20 59° 81° 47° (1985) 100° (1983) 0.14" 0"
Aug 21 59° 81° 45° (1985) 95° (1983) 0.13" 0"
Aug 22 59° 81° 47° (1985) 93° (1975) 0.14" 0"
Aug 23 59° 81° 50° (1984) 92° (1976) 0.12" 0"
Aug 24 59° 81° 44° (1984) 92° (1975) 0.12" 0"
Aug 25 58° 81° 46° (1977) 93° (2003) 0.13" 0"
Aug 26 58° 81° 49° (1977) 95° (2003) 0.12" 0"
Aug 27 58° 80° 51° (1985) 93° (1973) 0.12" 0"
Aug 28 58° 80° 40° (1986) 94° (1973) 0.13" 0"
Aug 29 57° 80° 42° (1986) 97° (1984) 0.12" 0"
Aug 30 57° 80° 42° (1986) 99° (1984) 0.12" 0"
Aug 31 57° 80° 44° (2009) 92° (1973) 0.13" 0"
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