Lanark, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 29° -31° (1910) 61° (2002) 1.43" 8.8"
February 13° 35° -30° (1996) 70° (2000) 1.52" 6.9"
March 25° 47° -16° (1962) 85° (1986) 2.63" 5.3"
April 35° 60° -2° (1982) 92° (1930) 3.67" 1.9"
May 46° 72° 20° (2005) 104° (1934) 4.34" 0"
June 54° 82° 31° (1988) 104° (1934) 4.77" 0"
July 59° 85° 35° (1904) 108° (1936) 3.83" 0"
August 56° 83° 32° (1986) 103° (1936) 4.54" 0"
September 47° 76° 23° (1983) 99° (1939) 3.48" 0"
October 36° 64° 4° (1925) 91° (1997) 2.73" 0.1"
November 26° 47° -15° (1976) 79° (2000) 2.84" 2.2"
December 14° 34° -28° (1914) 69° (1998) 2.02" 7.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 20° 39° -3° (1976) 60° (1962) 0.08" NA
Dec 2 19° 39° -6° (1976) 62° (1951) 0.08" NA
Dec 3 19° 38° -13° (1940) 66° (1951) 0.08" NA
Dec 4 18° 38° -5° (1991) 66° (1998) 0.08" NA
Dec 5 18° 38° -5° (1976) 69° (1998) 0.08" NA
Dec 6 17° 37° -8° (1964) 68° (2001) 0.08" NA
Dec 7 17° 37° -13° (1976) 63° (1916) 0.08" NA
Dec 8 17° 36° -11° (1902) 63° (1946) 0.07" NA
Dec 9 16° 36° -18° (1958) 61° (1946) 0.07" NA
Dec 10 16° 36° -22° (1919) 56° (1911) 0.07" NA
Dec 11 15° 35° -20° (1972) 62° (1949) 0.07" NA
Dec 12 15° 35° -11° (1976) 60° (1949) 0.07" NA
Dec 13 15° 35° -24° (1903) 59° (1991) 0.07" NA
Dec 14 14° 34° -20° (1904) 59° (1975) 0.07" NA
Dec 15 14° 34° -20° (1903) 57° (1975) 0.07" NA
Dec 16 14° 34° -15° (1951) 57° (1939) 0.06" NA
Dec 17 13° 33° -15° (1903) 56° (1984) 0.06" NA
Dec 18 13° 33° -19° (1985) 58° (1939) 0.06" NA
Dec 19 12° 33° -24° (1985) 59° (1918) 0.06" NA
Dec 20 12° 32° -23° (1985) 60° (1918) 0.06" NA
Dec 21 12° 32° -19° (1963) 58° (1918) 0.06" NA
Dec 22 11° 32° -18° (1963) 52° (1918) 0.06" NA
Dec 23 11° 31° -20° (1963) 56° (1965) 0.06" NA
Dec 24 11° 31° -23° (1983) 57° (1979) 0.06" NA
Dec 25 11° 31° -22° (2000) 57° (1982) 0.06" NA
Dec 26 10° 31° -28° (1914) 55° (1982) 0.05" NA
Dec 27 10° 31° -26° (1950) 55° (1946) 0.05" NA
Dec 28 10° 30° -22° (1924) 58° (1982) 0.05" NA
Dec 29 10° 30° -17° (1925) 65° (1984) 0.05" NA
Dec 30 30° -21° (1909) 58° (1929) 0.05" NA
Dec 31 30° -18° (1914) 59° (1965) 0.05" NA
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