Sterling/Rock Falls, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -11° -2° -32.8° (1999) 18.3° (2004) 1.57" 11.2"
February -9° -32.8° (1905) 21.7° (2000) 1.65" 5.8"
March -3° -25° (2002) 30.6° (1986) 2.47" 4.1"
April 16° -13.3° (1982) 33.9° (1986) 3.5" 0.7"
May 21° -4.4° (2005) 40.6° (1934) 4.41" 0"
June 15° 26° 1.1° (1945) 41.1° (1934) 4.9" 0"
July 17° 28° 6.1° (1904) 43.3° (1936) 4.14" 0"
August 16° 27° 2.8° (1934) 39.4° (1988) 4.5" 0"
September 11° 24° -5.6° (1942) 38.9° (1939) 3.55" 0"
October 17° -13.9° (1925) 33.9° (1963) 2.9" 0.1"
November -1° -22.2° (1977) 27.2° (1933) 2.69" 1.4"
December -9° -31.7° (1983) 20° (1998) 2.19" 6.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 -6° -18° (1976) 18° (1962) 0.09" 0.2"
Dec 2 -6° -19° (1942) 18° (1951) 0.08" 0.1"
Dec 3 -6° -23° (1940) 20° (1970) 0.09" 0.2"
Dec 4 -6° -21° (1991) 19° (1998) 0.08" 0.2"
Dec 5 -7° -21° (1991) 20° (1998) 0.09" 0.2"
Dec 6 -7° -22° (1977) 19° (2001) 0.08" 0.1"
Dec 7 -7° -22° (2005) 16° (1980) 0.09" 0.2"
Dec 8 -7° -23° (1902) 18° (1916) 0.08" 0.2"
Dec 9 -8° -27° (1958) 17° (1946) 0.08" 0.2"
Dec 10 -8° -28° (1919) 14° (1946) 0.08" 0.2"
Dec 11 -8° -25° (1972) 17° (1949) 0.09" 0.2"
Dec 12 -8° -23° (1962) 14° (1949) 0.07" 0.2"
Dec 13 -8° -26° (1903) 16° (1991) 0.08" 0.3"
Dec 14 -9° -24° (1901) 14° (1975) 0.07" 0.2"
Dec 15 -9° -28° (1917) 16° (1971) 0.07" 0.2"
Dec 16 -9° -27° (1951) 13° (1939) 0.07" 0.2"
Dec 17 -9° -24° (1945) 15° (1984) 0.07" 0.2"
Dec 18 -9° -25° (1985) 17° (1939) 0.06" 0.2"
Dec 19 -9° -28° (1983) 13° (1918) 0.06" 0.3"
Dec 20 -9° -1° -28° (1983) 13° (1949) 0.07" 0.2"
Dec 21 -10° -1° -28° (1963) 12° (1941) 0.06" 0.2"
Dec 22 -10° -1° -29° (1989) 14° (1957) 0.07" 0.3"
Dec 23 -10° -1° -31° (1989) 14° (1941) 0.06" 0.2"
Dec 24 -10° -1° -32° (1983) 14° (1979) 0.06" 0.3"
Dec 25 -10° -1° -31° (1983) 15° (1982) 0.06" 0.2"
Dec 26 -10° -1° -31° (1914) 14° (1982) 0.06" 0.3"
Dec 27 -10° -1° -29° (1950) 13° (1959) 0.06" 0.3"
Dec 28 -10° -1° -32° (1924) 15° (1982) 0.05" 0.2"
Dec 29 -10° -1° -24° (1917) 18° (1984) 0.06" 0.3"
Dec 30 -11° -2° -23° (1917) 15° (1936) 0.05" 0.3"
Dec 31 -11° -2° -26° (1914) 15° (2002) 0.05" 0.3"
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