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
May 1 19° -3° (1918) 31° (1952) 0.12" 0"
May 2 19° -2° (1911) 32° (1959) 0.13" 0"
May 3 19° -4° (2005) 32° (1913) 0.12" 0"
May 4 19° -4° (1907) 33° (1959) 0.13" 0"
May 5 20° -2° (1907) 34° (1934) 0.13" 0"
May 6 20° -2° (1954) 36° (1934) 0.13" 0"
May 7 20° -3° (1989) 34° (1934) 0.13" 0"
May 8 20° 0° (1923) 32° (1963) 0.13" 0"
May 9 20° -3° (1945) 35° (1934) 0.13" 0"
May 10 20° -3° (1966) 32° (1934) 0.13" 0"
May 11 21° -4° (1907) 32° (1911) 0.13" 0"
May 12 21° -2° (1938) 31° (1956) 0.14" 0"
May 13 21° -2° (1938) 32° (1956) 0.14" 0"
May 14 21° -1° (1920) 33° (1932) 0.14" 0"
May 15 21° -1° (1904) 32° (1944) 0.14" 0"
May 16 21° -2° (1997) 32° (1962) 0.14" 0"
May 17 22° 1° (1935) 33° (1934) 0.14" 0"
May 18 10° 22° -1° (2002) 34° (1934) 0.15" 0"
May 19 10° 22° 1° (1929) 35° (1934) 0.15" 0"
May 20 10° 22° 0° (1907) 34° (1934) 0.15" 0"
May 21 10° 22° -1° (2002) 34° (1934) 0.15" 0"
May 22 10° 22° 1° (1924) 34° (1925) 0.16" 0"
May 23 11° 23° 1° (1917) 34° (1921) 0.15" 0"
May 24 11° 23° 0° (1935) 34° (1921) 0.15" 0"
May 25 11° 23° -3° (1925) 34° (1967) 0.16" 0"
May 26 11° 23° 0° (1925) 36° (1911) 0.16" 0"
May 27 11° 23° 0° (1907) 35° (1911) 0.15" 0"
May 28 11° 23° 2° (1907) 34° (1911) 0.16" 0"
May 29 12° 24° 1° (1965) 37° (1934) 0.15" 0"
May 30 12° 24° 1° (1996) 37° (1934) 0.16" 0"
May 31 12° 24° 3° (1984) 41° (1934) 0.16" 0"
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