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
Sep 1 13.3° 25° 4° (1949) 37° (1953) 0.14" NA
Sep 2 13.3° 25° 3° (1946) 37° (1953) 0.13" NA
Sep 3 13.3° 25° 6° (1908) 37° (1913) 0.13" NA
Sep 4 12.8° 25° 4° (1974) 38° (1925) 0.13" NA
Sep 5 12.8° 24.4° 6° (1935) 37° (1922) 0.13" NA
Sep 6 12.8° 24.4° 4° (1988) 38° (1922) 0.13" NA
Sep 7 12.2° 24.4° 3° (1956) 39° (1939) 0.12" NA
Sep 8 12.2° 24.4° 4° (1949) 37° (1922) 0.12" NA
Sep 9 12.2° 23.9° 4° (1924) 37° (1933) 0.12" NA
Sep 10 11.7° 23.9° 3° (1924) 35° (1978) 0.12" NA
Sep 11 11.7° 23.9° 2° (1917) 36° (1978) 0.12" NA
Sep 12 11.7° 23.9° 3° (1955) 36° (1939) 0.11" NA
Sep 13 11.1° 23.3° 2° (1953) 37° (1939) 0.11" NA
Sep 14 11.1° 23.3° -1° (1923) 38° (1939) 0.11" NA
Sep 15 11.1° 23.3° 1.1° (2007) 39° (1939) 0.11" NA
Sep 16 10.6° 22.8° 1° (1916) 34° (1931) 0.11" NA
Sep 17 10.6° 22.8° 0° (1937) 34° (1906) 0.11" NA
Sep 18 10° 22.8° 1° (1916) 34° (1988) 0.1" NA
Sep 19 10° 22.2° 1° (1901) 34° (1947) 0.1" NA
Sep 20 10° 22.2° -1° (1956) 33° (1920) 0.1" NA
Sep 21 9.4° 22.2° 1° (1991) 34° (1920) 0.1" NA
Sep 22 9.4° 21.7° 0° (1974) 34° (1937) 0.1" NA
Sep 23 8.9° 21.7° -2° (1995) 34° (1937) 0.1" NA
Sep 24 8.9° 21.7° -1° (1950) 33° (1920) 0.1" NA
Sep 25 8.9° 21.1° -3° (1942) 35° (1920) 0.1" NA
Sep 26 8.3° 21.1° -2° (1926) 36° (1935) 0.1" NA
Sep 27 8.3° 21.1° -2° (1937) 32° (1998) 0.09" NA
Sep 28 7.8° 20.6° -6° (1942) 34° (1905) 0.09" NA
Sep 29 7.8° 20.6° -2° (1949) 35° (1953) 0.09" NA
Sep 30 7.8° 20.6° -2° (1984) 33° (1971) 0.09" NA
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