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