Sterling/Rock Falls, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -12° -3° -32.8° (1999) 18.3° (2004) 1.6" 9"
February -9° -32.8° (1905) 21.7° (2000) 1.43" 6.8"
March -3° -25° (2002) 30.6° (1986) 2.55" 5"
April 14° -13.3° (1982) 33.9° (1986) 3.61" 1.3"
May 21° -4.4° (2005) 40.6° (1934) 4.32" 0"
June 14° 26° 1.1° (1945) 41.1° (1934) 4.88" 0"
July 17° 28° 6.1° (1904) 43.3° (1936) 3.45" 0"
August 16° 27° 2.8° (1934) 39.4° (1988) 4.47" 0"
September 11° 23° -5.6° (1942) 38.9° (1939) 3.31" 0"
October 17° -13.9° (1925) 33.9° (1963) 2.71" 0.2"
November -2° -22.2° (1977) 27.2° (1933) 2.82" 1.5"
December -8° -1° -31.7° (1983) 20° (1998) 2.13" 9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Feb 1 -11.7° -2.2° -30° (1918) 18° (1989) 0.05" NA
Feb 2 -11.7° -2.2° -29° (1951) 12° (1927) 0.05" NA
Feb 3 -11.7° -2.2° -31° (1996) 13° (1927) 0.05" NA
Feb 4 -11.7° -2.2° -31° (1996) 11° (1992) 0.05" NA
Feb 5 -11.1° -1.7° -29° (1936) 14° (1909) 0.04" NA
Feb 6 -11.1° -1.7° -32° (1982) 13° (1946) 0.05" NA
Feb 7 -11.1° -1.7° -32° (1982) 9° (2005) 0.05" NA
Feb 8 -10.6° -1.7° -27° (1905) 14° (1925) 0.05" NA
Feb 9 -10.6° -1.1° -31° (1933) 16° (1990) 0.05" NA
Feb 10 -10.6° -1.1° -29° (1982) 14° (1976) 0.05" NA
Feb 11 -10° -1.1° -29° (1982) 16° (1999) 0.05" NA
Feb 12 -10° -0.6° -30° (1981) 20° (1999) 0.05" NA
Feb 13 -10° -0.6° -33° (1905) 16° (1938) 0.05" NA
Feb 14 -9.4° -0.6° -27° (1905) 16° (1954) 0.05" NA
Feb 15 -9.4° -27° (1905) 21° (1921) 0.05" NA
Feb 16 -9.4° -26° (1905) 18° (1921) 0.05" NA
Feb 17 -8.9° -26° (1903) 14° (1911) 0.05" NA
Feb 18 -8.9° 0.6° -29° (1936) 15° (1981) 0.05" NA
Feb 19 -8.9° 0.6° -29° (1936) 18° (1930) 0.05" NA
Feb 20 -8.3° 0.6° -30° (1929) 17° (1930) 0.05" NA
Feb 21 -8.3° 1.1° -23° (1963) 18° (1930) 0.05" NA
Feb 22 -7.8° 1.1° -27° (1936) 18° (1922) 0.05" NA
Feb 23 -7.8° 1.7° -23° (1910) 17° (1930) 0.05" NA
Feb 24 -7.8° 1.7° -24° (1910) 18° (1930) 0.05" NA
Feb 25 -7.2° 1.7° -25° (1940) 19° (1932) 0.06" NA
Feb 26 -7.2° 2.2° -25° (1950) 22° (2000) 0.06" NA
Feb 27 -6.7° 2.2° -23° (1994) 21° (1976) 0.06" NA
Feb 28 -6.7° 2.8° -20° (1901) 17° (1932) 0.06" NA
Feb 29 -6.7° 2.8° -19° (1980) 17° (1932) 0.06" NA
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