Rock Falls, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 24° -34° (1899) 62° (2002) 0.82" NA
February 12° 29° -35° (1899) 67° (1981) 0.92" NA
March 23° 41° -32° (1962) 84° (1986) 2.01" NA
April 35° 57° 5° (1982) 95° (1980) 3.55" NA
May 46° 69° 23° (1967) 104° (1934) 4.96" NA
June 57° 79° 31° (1928) 104° (1934) 5.36" NA
July 61° 82° 38° (1899) 107° (1936) 4.68" NA
August 58° 80° 30° (1915) 103° (1930) 4.2" NA
September 49° 73° 15° (1899) 103° (1922) 3.18" NA
October 37° 60° -4° (1925) 94° (1963) 2.38" NA
November 25° 43° -14° (1897) 79° (2006) 1.99" NA
December 11° 28° -26° (1983) 65° (1998) 1.19" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 41° 64° 25° (1909) 90° (2007) 0.14" NA
May 2 42° 65° 23° (1967) 91° (1992) 0.14" NA
May 3 42° 65° 23° (1967) 91° (1918) 0.15" NA
May 4 42° 65° 24° (1907) 90° (1918) 0.14" NA
May 5 43° 66° 24° (1900) 91° (1924) 0.15" NA
May 6 43° 66° 25° (1989) 95° (1934) 0.14" NA
May 7 44° 66° 26° (1925) 89° (1934) 0.15" NA
May 8 44° 67° 27° (1925) 91° (1934) 0.15" NA
May 9 44° 67° 23° (1945) 88° (1911) 0.16" NA
May 10 45° 67° 27° (1909) 89° (1911) 0.16" NA
May 11 45° 68° 25° (1925) 89° (1987) 0.16" NA
May 12 45° 68° 29° (1928) 90° (1907) 0.16" NA
May 13 46° 68° 27° (1953) 91° (1940) 0.16" NA
May 14 46° 68° 30° (1910) 90° (1932) 0.16" NA
May 15 46° 69° 28° (1983) 90° (1988) 0.16" NA
May 16 46° 69° 26° (1921) 91° (1918) 0.17" NA
May 17 47° 69° 28° (1930) 94° (1934) 0.17" NA
May 18 47° 70° 33° (1925) 97° (1934) 0.16" NA
May 19 47° 70° 27° (1929) 97° (1934) 0.17" NA
May 20 48° 70° 28° (1907) 96° (1934) 0.16" NA
May 21 48° 71° 32° (1931) 93° (1970) 0.16" NA
May 22 48° 71° 29° (1931) 100° (1925) 0.16" NA
May 23 49° 71° 28° (1963) 88° (1926) 0.16" NA
May 24 49° 72° 32° (1924) 92° (1939) 0.16" NA
May 25 49° 72° 29° (1925) 93° (1978) 0.18" NA
May 26 50° 72° 32° (1961) 91° (1978) 0.17" NA
May 27 50° 72° 32° (1907) 92° (1980) 0.17" NA
May 28 50° 73° 32° (1947) 92° (1969) 0.17" NA
May 29 51° 73° 31° (1947) 98° (1934) 0.17" NA
May 30 51° 73° 31° (1930) 98° (1934) 0.17" NA
May 31 51° 74° 35° (1931) 104° (1934) 0.18" NA
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