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
Jul 1 16.1° 27.8° 7° (1924) 39° (1931) 0.13" NA
Jul 2 16.1° 27.8° 7° (1904) 37° (1910) 0.13" NA
Jul 3 16.1° 27.8° 7° (1907) 37° (1911) 0.13" NA
Jul 4 16.7° 27.8° 7° (1940) 39° (1911) 0.12" NA
Jul 5 16.7° 27.8° 7° (1972) 38° (1911) 0.12" NA
Jul 6 16.7° 27.8° 7° (1979) 39° (1911) 0.12" NA
Jul 7 16.7° 27.8° 7° (1984) 39° (1936) 0.12" NA
Jul 8 16.7° 27.8° 8° (1915) 39° (1936) 0.11" NA
Jul 9 16.7° 27.8° 10° (1918) 39° (1936) 0.11" NA
Jul 10 16.7° 27.8° 9° (1996) 40° (1936) 0.11" NA
Jul 11 16.7° 27.8° 7° (1945) 41° (1936) 0.11" NA
Jul 12 16.7° 27.8° 9° (1918) 42° (1936) 0.11" NA
Jul 13 16.7° 27.8° 8° (1940) 42° (1936) 0.11" NA
Jul 14 16.7° 27.8° 8° (1926) 43° (1936) 0.1" NA
Jul 15 16.7° 27.8° 8° (1930) 39° (1936) 0.1" NA
Jul 16 17.2° 27.8° 7° (1945) 39° (1901) 0.1" NA
Jul 17 17.2° 27.8° 8° (1940) 37° (1921) 0.1" NA
Jul 18 17.2° 27.8° 9° (1924) 38° (1966) 0.1" NA
Jul 19 17.2° 27.8° 9° (1909) 38° (1930) 0.1" NA
Jul 20 17.2° 27.8° 9° (1941) 40° (1901) 0.1" NA
Jul 21 17.2° 27.8° 8° (1944) 42° (1901) 0.1" NA
Jul 22 17.2° 27.8° 7° (1947) 39° (1934) 0.1" NA
Jul 23 17.2° 27.8° 6° (1904) 40° (1901) 0.11" NA
Jul 24 17.2° 27.8° 7° (1904) 42° (1901) 0.11" NA
Jul 25 17.2° 27.8° 10° (1911) 40° (1940) 0.11" NA
Jul 26 17.2° 27.8° 8° (1911) 40° (1936) 0.11" NA
Jul 27 17.2° 27.8° 8° (1937) 39° (1930) 0.11" NA
Jul 28 16.7° 27.8° 9° (1925) 38° (1931) 0.11" NA
Jul 29 16.7° 27.8° 8° (1925) 38° (1931) 0.12" NA
Jul 30 16.7° 27.8° 8° (1936) 38° (1913) 0.12" NA
Jul 31 16.7° 27.8° 8° (1918) 39° (1913) 0.12" NA
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