Flagg, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 11° 28° -33° (1985) 60° (2002) 1.55" 8.3"
February 16° 33° -24° (1979) 69° (2000) 1.5" 3.8"
March 26° 45° -14° (2002) 84° (1986) 1.89" 2.8"
April 37° 59° 8° (1982) 91° (1986) 3.21" 0.5"
May 48° 70° 25° (2005) 96° (1985) 3.98" 0"
June 58° 79° 36° (1992) 101° (1988) 4.16" 0"
July 61° 83° 45° (1984) 101° (1995) 3.56" 0"
August 60° 81° 39° (1986) 100° (1988) 4.06" 0"
September 51° 74° 24° (1984) 94° (2002) 3.17" 0"
October 39° 62° 16° (1988) 89° (1997) 2.87" 0"
November 29° 47° 1° (1986) 77° (2000) 2.53" 0.7"
December 16° 32° -22° (2000) 66° (1998) 1.94" 6.2"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 22° 38° 8° (1985) 59° (1998) 0.08" 0.2"
Dec 2 22° 37° -2° (1985) 63° (1982) 0.08" 0.2"
Dec 3 21° 37° -5° (2006) 65° (1982) 0.08" 0.1"
Dec 4 21° 36° -5° (1991) 66° (1998) 0.07" 0.2"
Dec 5 20° 36° -4° (1991) 66° (1998) 0.08" 0.2"
Dec 6 20° 35° -6° (2006) 65° (2001) 0.08" 0.1"
Dec 7 19° 35° -1° (2007) 59° (1980) 0.07" 0.2"
Dec 8 19° 34° -7° (2006) 53° (1987) 0.08" 0.2"
Dec 9 18° 34° -12° (1978) 59° (1991) 0.07" 0.2"
Dec 10 18° 33° -12° (1978) 49° (1993) 0.07" 0.2"
Dec 11 18° 33° -15° (1978) 53° (1979) 0.08" 0.2"
Dec 12 17° 33° -4° (1989) 52° (1979) 0.07" 0.2"
Dec 13 17° 32° -13° (2000) 59° (1991) 0.06" 0.2"
Dec 14 17° 32° -8° (1989) 47° (1998) 0.07" 0.3"
Dec 15 16° 32° -19° (1989) 54° (1984) 0.06" 0.2"
Dec 16 16° 31° -15° (1989) 59° (1984) 0.06" 0.2"
Dec 17 16° 31° -10° (1985) 54° (2006) 0.05" 0.2"
Dec 18 15° 31° -19° (1983) 52° (2002) 0.06" 0.2"
Dec 19 15° 30° -18° (1983) 56° (2002) 0.05" 0.2"
Dec 20 15° 30° -9° (1985) 56° (1988) 0.05" 0.2"
Dec 21 14° 30° -17° (1989) 52° (1988) 0.06" 0.2"
Dec 22 14° 30° -21° (1989) 50° (1984) 0.05" 0.2"
Dec 23 14° 30° -22° (1983) 50° (1979) 0.06" 0.2"
Dec 24 14° 29° -20° (1989) 58° (1979) 0.05" 0.2"
Dec 25 13° 29° -22° (2000) 58° (1982) 0.05" 0.2"
Dec 26 13° 29° -21° (2000) 57° (1982) 0.05" 0.2"
Dec 27 13° 29° -8° (1978) 58° (1984) 0.05" 0.2"
Dec 28 13° 29° -18° (1983) 66° (1984) 0.05" 0.3"
Dec 29 13° 29° -13° (1983) 61° (1984) 0.05" 0.2"
Dec 30 13° 29° -6° (1983) 50° (2006) 0.05" 0.2"
Dec 31 12° 28° -4° (1998) 59° (2002) 0.05" 0.2"
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