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
Dec 1 21° 38° -1° (1976) 58° (1998) 0.07" 0.3"
Dec 2 21° 37° -5° (1976) 64° (1982) 0.07" 0.3"
Dec 3 20° 37° -5° (1976) 62° (1982) 0.07" 0.2"
Dec 4 20° 36° -4° (1991) 63° (1998) 0.07" 0.3"
Dec 5 20° 36° -4° (2005) 66° (1998) 0.07" 0.3"
Dec 6 19° 36° -6° (1977) 67° (2001) 0.07" 0.2"
Dec 7 19° 35° -10° (2005) 56° (1980) 0.07" 0.3"
Dec 8 18° 35° -10° (2005) 50° (1981) 0.07" 0.3"
Dec 9 18° 34° -7° (1977) 55° (1991) 0.06" 0.3"
Dec 10 17° 34° -13° (1977) 48° (1993) 0.07" 0.3"
Dec 11 17° 33° -14° (1977) 55° (1979) 0.07" 0.3"
Dec 12 17° 33° -10° (1976) 53° (1979) 0.06" 0.3"
Dec 13 16° 33° -12° (2000) 58° (1991) 0.06" 0.4"
Dec 14 16° 32° -14° (1985) 58° (1975) 0.05" 0.3"
Dec 15 16° 32° -13° (1989) 58° (1975) 0.06" 0.4"
Dec 16 15° 32° -9° (1989) 55° (1984) 0.05" 0.3"
Dec 17 15° 31° -8° (1989) 56° (1984) 0.05" 0.4"
Dec 18 15° 31° -13° (1985) 53° (2002) 0.05" 0.3"
Dec 19 14° 31° -20° (1983) 49° (2001) 0.05" 0.3"
Dec 20 14° 31° -18° (1983) 54° (1988) 0.05" 0.4"
Dec 21 14° 30° -17° (1989) 48° (1988) 0.05" 0.3"
Dec 22 14° 30° -17° (1989) 47° (2003) 0.05" 0.4"
Dec 23 14° 30° -20° (1989) 50° (1979) 0.06" 0.3"
Dec 24 13° 30° -22° (1983) 56° (1979) 0.04" 0.3"
Dec 25 13° 30° -22° (1983) 57° (1982) 0.05" 0.4"
Dec 26 13° 29° -23° (2000) 57° (1982) 0.04" 0.3"
Dec 27 13° 29° -9° (1990) 50° (2008) 0.05" 0.3"
Dec 28 13° 29° -12° (2000) 59° (1982) 0.04" 0.3"
Dec 29 12° 29° -8° (2000) 63° (1984) 0.05" 0.3"
Dec 30 12° 29° -7° (1983) 48° (2006) 0.05" 0.3"
Dec 31 12° 29° -17° (1976) 57° (2002) 0.04" 0.3"
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