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
May 1 6.1° 17.8° -3° (1918) 31° (1952) 0.13" NA
May 2 6.1° 18.3° -2° (1911) 32° (1959) 0.13" NA
May 3 6.7° 18.3° -4° (2005) 32° (1913) 0.13" NA
May 4 6.7° 18.3° -4° (1907) 33° (1959) 0.13" NA
May 5 7.2° 18.9° -2° (1907) 34° (1934) 0.13" NA
May 6 7.2° 18.9° -2° (1954) 36° (1934) 0.13" NA
May 7 7.2° 19.4° -3° (1989) 34° (1934) 0.13" NA
May 8 7.8° 19.4° 0° (1923) 32° (1963) 0.13" NA
May 9 7.8° 19.4° -3° (1945) 35° (1934) 0.13" NA
May 10 7.8° 20° -3° (1966) 32° (1934) 0.13" NA
May 11 8.3° 20° -4° (1907) 32° (1911) 0.13" NA
May 12 8.3° 20° -2° (1938) 31° (1956) 0.13" NA
May 13 8.3° 20.6° -2° (1938) 32° (1956) 0.13" NA
May 14 8.9° 20.6° -1° (1920) 33° (1932) 0.13" NA
May 15 8.9° 20.6° -1° (1904) 32° (1944) 0.14" NA
May 16 9.4° 21.1° -2° (1997) 32° (1962) 0.14" NA
May 17 9.4° 21.1° 1° (1935) 33° (1934) 0.14" NA
May 18 9.4° 21.1° -1° (2002) 34° (1934) 0.14" NA
May 19 10° 21.7° 1° (1929) 35° (1934) 0.14" NA
May 20 10° 21.7° 0° (1907) 34° (1934) 0.14" NA
May 21 10° 21.7° -1° (2002) 34° (1934) 0.14" NA
May 22 10.6° 22.2° 1° (1924) 34° (1925) 0.14" NA
May 23 10.6° 22.2° 1° (1917) 34° (1921) 0.15" NA
May 24 10.6° 22.8° 0° (1935) 34° (1921) 0.15" NA
May 25 11.1° 22.8° -3° (1925) 34° (1967) 0.15" NA
May 26 11.1° 22.8° 0° (1925) 36° (1911) 0.15" NA
May 27 11.1° 23.3° 0° (1907) 35° (1911) 0.15" NA
May 28 11.7° 23.3° 2° (1907) 34° (1911) 0.15" NA
May 29 11.7° 23.3° 1° (1965) 37° (1934) 0.16" NA
May 30 11.7° 23.9° 1° (1996) 37° (1934) 0.16" NA
May 31 12.2° 23.9° 3° (1984) 41° (1934) 0.16" NA
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