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
Apr 1 11.1° -10° (1924) 29° (1986) 0.1" NA
Apr 2 0.6° 11.1° -8° (1926) 28° (2003) 0.11" NA
Apr 3 0.6° 11.7° -9° (1954) 27° (1921) 0.11" NA
Apr 4 0.6° 11.7° -8° (1936) 28° (1929) 0.11" NA
Apr 5 1.1° 11.7° -12° (1975) 28° (1929) 0.11" NA
Apr 6 1.1° 12.2° -12° (1982) 28° (1929) 0.11" NA
Apr 7 1.1° 12.2° -13° (1982) 29° (1991) 0.11" NA
Apr 8 1.7° 12.8° -11° (1982) 28° (1931) 0.11" NA
Apr 9 1.7° 12.8° -9° (1997) 28° (1931) 0.12" NA
Apr 10 1.7° 13.3° -7° (1909) 33° (1930) 0.12" NA
Apr 11 2.2° 13.3° -6° (1973) 33° (1930) 0.12" NA
Apr 12 2.2° 13.9° -8° (1939) 32° (1930) 0.12" NA
Apr 13 2.2° 13.9° -8° (1939) 28° (1977) 0.12" NA
Apr 14 2.8° 13.9° -9° (1904) 29.4° (2006) 0.12" NA
Apr 15 2.8° 14.4° -7° (1928) 30° (2003) 0.12" NA
Apr 16 3.3° 14.4° -8° (1949) 31° (2002) 0.12" NA
Apr 17 3.3° 15° -9° (1904) 31° (1977) 0.12" NA
Apr 18 3.3° 15° -5° (1926) 31° (1977) 0.12" NA
Apr 19 3.9° 15.6° -7° (1983) 33° (2002) 0.12" NA
Apr 20 3.9° 15.6° -9° (1904) 30° (1985) 0.12" NA
Apr 21 3.9° 15.6° -11° (1904) 32° (1987) 0.13" NA
Apr 22 4.4° 16.1° -6° (1986) 31° (1985) 0.13" NA
Apr 23 4.4° 16.1° -5° (1910) 32° (1980) 0.13" NA
Apr 24 4.4° 16.7° -8° (1910) 31° (1915) 0.13" NA
Apr 25 16.7° -6° (1934) 30° (1915) 0.13" NA
Apr 26 16.7° -3° (1907) 34° (1986) 0.13" NA
Apr 27 5.6° 17.2° -4° (1946) 32° (1986) 0.13" NA
Apr 28 5.6° 17.2° -3° (1950) 32° (1952) 0.13" NA
Apr 29 5.6° 17.8° -3° (1958) 33° (1970) 0.13" NA
Apr 30 6.1° 17.8° -2° (1907) 33° (1942) 0.13" NA
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