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
Jan 1 -11° -2° -25° (1977) 12.2° (2007) 0.05" 0.3"
Jan 2 -11° -2° -28° (1979) 11° (1950) 0.06" 0.4"
Jan 3 -11° -2° -28° (1979) 18° (2004) 0.05" 0.3"
Jan 4 -11° -2° -31° (1919) 15° (1998) 0.06" 0.3"
Jan 5 -11° -2° -33° (1999) 15° (1997) 0.05" 0.4"
Jan 6 -11° -2° -33° (1999) 12° (1933) 0.05" 0.4"
Jan 7 -11° -2° -29° (1912) 17° (2008) 0.06" 0.3"
Jan 8 -11° -2° -29° (1942) 17° (2008) 0.05" 0.4"
Jan 9 -11° -2° -26° (1979) 15° (1939) 0.06" 0.4"
Jan 10 -11° -2° -30° (1982) 14° (1975) 0.05" 0.4"
Jan 11 -11° -2° -31° (1982) 11° (1980) 0.06" 0.3"
Jan 12 -11° -2° -28° (1974) 14° (1960) 0.05" 0.4"
Jan 13 -11° -2° -28° (1912) 12° (1960) 0.05" 0.4"
Jan 14 -11° -2° -29° (1917) 14° (1928) 0.05" 0.4"
Jan 15 -12° -2° -30° (1994) 13° (1949) 0.05" 0.4"
Jan 16 -12° -2° -36° (2009) 12° (1933) 0.05" 0.4"
Jan 17 -12° -2° -36° (2009) 13° (1990) 0.05" 0.4"
Jan 18 -12° -2° -31° (1930) 13° (1996) 0.05" 0.4"
Jan 19 -12° -2° -31° (1994) 13° (1996) 0.05" 0.4"
Jan 20 -12° -2° -32° (1985) 16° (1906) 0.05" 0.3"
Jan 21 -12° -2° -33° (1985) 16° (1906) 0.05" 0.4"
Jan 22 -12° -2° -32° (1930) 14° (1964) 0.05" 0.3"
Jan 23 -12° -2° -31° (1936) 14° (1909) 0.04" 0.4"
Jan 24 -12° -2° -28° (1936) 17° (1909) 0.05" 0.4"
Jan 25 -12° -2° -28° (1936) 16° (1950) 0.05" 0.3"
Jan 26 -12° -2° -30° (1982) 16° (1944) 0.04" 0.4"
Jan 27 -12° -2° -32° (1982) 17° (1944) 0.05" 0.3"
Jan 28 -11° -2° -30° (1963) 16° (2002) 0.05" 0.3"
Jan 29 -11° -1° -29° (1915) 12° (2002) 0.04" 0.4"
Jan 30 -11° -1° -29° (1918) 12° (1929) 0.05" 0.3"
Jan 31 -11° -1° -27° (1965) 12° (1988) 0.05" 0.3"
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