Sterling/Rock Falls, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 12° 29° -27° (1999) 65° (2004) 1.57" 11.2"
February 16° 34° -27° (1905) 71° (2000) 1.65" 5.8"
March 27° 46° -13° (2002) 87° (1986) 2.47" 4.1"
April 38° 60° 8° (1982) 93° (1986) 3.5" 0.7"
May 49° 71° 24° (2005) 105° (1934) 4.41" 0"
June 59° 79° 34° (1945) 106° (1934) 4.9" 0"
July 63° 83° 43° (1904) 110° (1936) 4.14" 0"
August 61° 81° 37° (1934) 103° (1988) 4.5" 0"
September 51° 75° 22° (1942) 102° (1939) 3.55" 0"
October 40° 62° 7° (1925) 93° (1963) 2.9" 0.1"
November 29° 47° -8° (1977) 81° (1933) 2.69" 1.4"
December 17° 33° -25° (1983) 68° (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 44° 66° 27° (1918) 88° (1952) 0.12" 0"
May 2 44° 66° 29° (1911) 89° (1959) 0.13" 0"
May 3 44° 67° 24° (2005) 89° (1913) 0.12" 0"
May 4 45° 67° 25° (1907) 92° (1959) 0.13" 0"
May 5 45° 67° 28° (1907) 93° (1934) 0.13" 0"
May 6 45° 68° 29° (1954) 96° (1934) 0.13" 0"
May 7 46° 68° 27° (1989) 94° (1934) 0.13" 0"
May 8 46° 68° 32° (1923) 90° (1963) 0.13" 0"
May 9 46° 69° 26° (1945) 95° (1934) 0.13" 0"
May 10 47° 69° 26° (1966) 90° (1934) 0.13" 0"
May 11 47° 69° 25° (1907) 90° (1911) 0.13" 0"
May 12 47° 69° 28° (1938) 88° (1956) 0.14" 0"
May 13 48° 70° 29° (1938) 90° (1956) 0.14" 0"
May 14 48° 70° 30° (1920) 91° (1932) 0.14" 0"
May 15 48° 70° 31° (1904) 90° (1944) 0.14" 0"
May 16 49° 71° 28° (1997) 90° (1962) 0.14" 0"
May 17 49° 71° 33° (1935) 91° (1934) 0.14" 0"
May 18 49° 71° 31° (2002) 94° (1934) 0.15" 0"
May 19 50° 71° 33° (1929) 95° (1934) 0.15" 0"
May 20 50° 72° 32° (1907) 94° (1934) 0.15" 0"
May 21 50° 72° 30° (2002) 94° (1934) 0.15" 0"
May 22 51° 72° 34° (1924) 93° (1925) 0.16" 0"
May 23 51° 73° 33° (1917) 94° (1921) 0.15" 0"
May 24 51° 73° 32° (1935) 93° (1921) 0.15" 0"
May 25 52° 73° 26° (1925) 93° (1967) 0.16" 0"
May 26 52° 73° 32° (1925) 96° (1911) 0.16" 0"
May 27 52° 74° 32° (1907) 95° (1911) 0.15" 0"
May 28 53° 74° 35° (1907) 94° (1911) 0.16" 0"
May 29 53° 74° 33° (1965) 98° (1934) 0.15" 0"
May 30 53° 75° 34° (1996) 98° (1934) 0.16" 0"
May 31 54° 75° 37° (1984) 105° (1934) 0.16" 0"
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