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
Mar 1 -6° -24° (1962) 18° (2000) 0.07" 0.2"
Mar 2 -6° -22° (1913) 20° (1974) 0.08" 0.2"
Mar 3 -6° -21° (1913) 23° (1974) 0.07" 0.2"
Mar 4 -5° -25° (2002) 23° (1983) 0.07" 0.2"
Mar 5 -5° -24° (2002) 21° (1921) 0.08" 0.2"
Mar 6 -5° -22° (1960) 23° (1983) 0.07" 0.1"
Mar 7 -5° -21° (1943) 22° (2000) 0.07" 0.2"
Mar 8 -4° -24° (1943) 26° (2000) 0.08" 0.2"
Mar 9 -4° -19° (1996) 24° (2000) 0.07" 0.2"
Mar 10 -4° -18° (1984) 22° (1955) 0.08" 0.1"
Mar 11 -4° -18° (1943) 22° (1972) 0.07" 0.2"
Mar 12 -4° -19° (1948) 22° (1990) 0.08" 0.2"
Mar 13 -3° -15° (1912) 26° (1990) 0.08" 0.1"
Mar 14 -3° -15° (1960) 23.3° (2007) 0.07" 0.2"
Mar 15 -3° -15° (1979) 23° (1995) 0.08" 0.1"
Mar 16 -3° -15° (1923) 27° (1945) 0.08" 0.2"
Mar 17 -3° -18° (1941) 23° (1945) 0.08" 0.1"
Mar 18 -2° -18° (1941) 24° (2009) 0.08" 0.1"
Mar 19 -2° -23° (1923) 28° (1921) 0.08" 0.2"
Mar 20 -2° -15° (1965) 26° (1921) 0.08" 0.1"
Mar 21 -2° -13° (1951) 26° (1938) 0.08" 0.1"
Mar 22 -2° -16° (1912) 29° (1907) 0.08" 0.1"
Mar 23 -1° 10° -16° (1940) 28° (1939) 0.09" 0.1"
Mar 24 -1° 10° -17° (1974) 27° (1939) 0.07" 0"
Mar 25 -1° 10° -14° (1940) 29° (1910) 0.08" 0.1"
Mar 26 -1° 11° -13° (1955) 27° (1910) 0.09" 0.1"
Mar 27 -1° 11° -13° (1965) 27° (1945) 0.09" 0.1"
Mar 28 11° -11° (1964) 27° (1910) 0.09" 0"
Mar 29 11° -11° (1969) 28° (1910) 0.09" 0.1"
Mar 30 12° -13° (1969) 31° (1986) 0.09" 0"
Mar 31 12° -13° (1923) 27° (1986) 0.1" 0.1"
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