Sterling/Rock Falls, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 10° 26° -27° (1999) 65° (2004) 1.6" 9"
February 15° 32° -27° (1905) 71° (2000) 1.43" 6.8"
March 27° 44° -13° (2002) 87° (1986) 2.55" 5"
April 37° 58° 8° (1982) 93° (1986) 3.61" 1.3"
May 48° 70° 24° (2005) 105° (1934) 4.32" 0"
June 58° 79° 34° (1945) 106° (1934) 4.88" 0"
July 62° 82° 43° (1904) 110° (1936) 3.45" 0"
August 60° 80° 37° (1934) 103° (1988) 4.47" 0"
September 51° 73° 22° (1942) 102° (1939) 3.31" 0"
October 39° 62° 7° (1925) 93° (1963) 2.71" 0.2"
November 28° 45° -8° (1977) 81° (1933) 2.82" 1.5"
December 17° 31° -25° (1983) 68° (1998) 2.13" 9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 22° 37° -1° (1976) 64° (1962) 0.08" NA
Dec 2 22° 37° -3° (1942) 64° (1951) 0.08" NA
Dec 3 21° 36° -9° (1940) 68° (1970) 0.08" NA
Dec 4 21° 36° -6° (1991) 67° (1998) 0.08" NA
Dec 5 21° 35° -6° (1991) 68° (1998) 0.08" NA
Dec 6 20° 35° -8° (1977) 66° (2001) 0.08" NA
Dec 7 20° 35° -7° (1936) 60° (1980) 0.08" NA
Dec 8 19° 34° -9° (1902) 65° (1916) 0.08" NA
Dec 9 19° 34° -16° (1958) 62° (1946) 0.07" NA
Dec 10 19° 33° -19° (1919) 57° (1946) 0.07" NA
Dec 11 18° 33° -13° (1972) 62° (1949) 0.07" NA
Dec 12 18° 32° -9° (1962) 58° (1949) 0.07" NA
Dec 13 17° 32° -14° (1903) 60° (1991) 0.07" NA
Dec 14 17° 32° -12° (1901) 58° (1975) 0.07" NA
Dec 15 17° 31° -19° (1917) 60° (1971) 0.07" NA
Dec 16 16° 31° -16° (1951) 56° (1939) 0.07" NA
Dec 17 16° 31° -12° (1945) 59° (1984) 0.07" NA
Dec 18 16° 30° -13° (1985) 63° (1939) 0.07" NA
Dec 19 15° 30° -18° (1983) 55° (1918) 0.07" NA
Dec 20 15° 30° -18° (1983) 56° (1949) 0.06" NA
Dec 21 15° 29° -18° (1963) 54° (1941) 0.06" NA
Dec 22 14° 29° -21° (1989) 57° (1957) 0.06" NA
Dec 23 14° 29° -23° (1989) 57° (1941) 0.06" NA
Dec 24 14° 29° -25° (1983) 58° (1979) 0.06" NA
Dec 25 13° 28° -24° (1983) 59° (1982) 0.06" NA
Dec 26 13° 28° -23° (1914) 58° (1982) 0.06" NA
Dec 27 13° 28° -21° (1950) 56° (1959) 0.06" NA
Dec 28 12° 28° -25° (1924) 59° (1982) 0.06" NA
Dec 29 12° 27° -11° (1917) 65° (1984) 0.06" NA
Dec 30 12° 27° -10° (1917) 59° (1936) 0.06" NA
Dec 31 11° 27° -15° (1914) 59° (2002) 0.06" NA
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