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
Aug 1 16.7° 27.8° 9° (1925) 37° (1945) 0.12" NA
Aug 2 16.7° 27.8° 9° (1927) 38° (1988) 0.13" NA
Aug 3 16.7° 27.8° 6° (1912) 39° (1930) 0.13" NA
Aug 4 16.7° 27.8° 7° (1912) 38° (1930) 0.13" NA
Aug 5 16.7° 27.8° 8° (1910) 37° (1918) 0.14" NA
Aug 6 16.7° 27.8° 8° (1910) 38° (1947) 0.14" NA
Aug 7 16.7° 27.8° 8° (1903) 36° (1937) 0.14" NA
Aug 8 16.7° 27.2° 7° (1904) 38° (1930) 0.14" NA
Aug 9 16.1° 27.2° 7° (1927) 38° (1934) 0.14" NA
Aug 10 16.1° 27.2° 9° (1982) 37° (1936) 0.15" NA
Aug 11 16.1° 27.2° 7° (1982) 37° (1941) 0.15" NA
Aug 12 16.1° 27.2° 6° (1903) 36° (1918) 0.15" NA
Aug 13 16.1° 27.2° 8° (1931) 36° (1944) 0.15" NA
Aug 14 16.1° 27.2° 6° (1904) 38° (1944) 0.15" NA
Aug 15 16.1° 27.2° 8° (1929) 37° (1988) 0.15" NA
Aug 16 16.1° 26.7° 8° (1992) 38° (1937) 0.15" NA
Aug 17 15.6° 26.7° 9° (1924) 39° (1988) 0.15" NA
Aug 18 15.6° 26.7° 7° (1963) 39° (1936) 0.15" NA
Aug 19 15.6° 26.7° 8° (1932) 39° (1936) 0.15" NA
Aug 20 15° 26.7° 4° (1950) 37° (1947) 0.15" NA
Aug 21 15° 26.7° 5° (1950) 39° (1983) 0.15" NA
Aug 22 15° 26.7° 6° (1923) 38° (1947) 0.15" NA
Aug 23 15° 26.1° 7° (1920) 38° (1947) 0.15" NA
Aug 24 15° 26.1° 4° (1942) 38° (1947) 0.15" NA
Aug 25 14.4° 26.1° 4° (1934) 36° (1909) 0.15" NA
Aug 26 14.4° 26.1° 5° (1934) 36° (2003) 0.15" NA
Aug 27 14.4° 26.1° 7° (1915) 36° (1973) 0.15" NA
Aug 28 13.9° 25.6° 4° (1915) 36° (1976) 0.14" NA
Aug 29 13.9° 25.6° 3° (1934) 37° (1983) 0.14" NA
Aug 30 13.9° 25.6° 4° (1915) 37° (1984) 0.14" NA
Aug 31 13.9° 25.6° 4° (1915) 37° (1953) 0.14" NA
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