Denison, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 27° -40° (1912) 68° (2002) 0.8" 6.3"
February 14° 33° -37° (1905) 69° (1999) 0.75" 7.1"
March 24° 45° -23° (1960) 88° (1986) 2.16" 7"
April 36° 59° 5° (1936) 95° (1910) 3.03" 1.7"
May 49° 70° 2° (1931) 105° (1934) 4.14" 0"
June 59° 80° 30° (1903) 109° (1933) 4.26" 0"
July 64° 84° 39° (1911) 112° (1936) 3.87" 0"
August 62° 81° 34° (1915) 111° (1934) 3.29" 0"
September 52° 74° 21° (1918) 103° (1939) 3.3" 0"
October 40° 62° -1° (1925) 92° (1963) 2.3" 0.6"
November 25° 44° -16° (1937) 80° (2006) 1.58" 3"
December 13° 31° -26° (1989) 69° (1939) 1" 7.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 43° 65° 23° (1909) 92° (1987) 0.12" NA
May 2 44° 65° 17° (1907) 90° (1968) 0.12" NA
May 3 44° 66° 17° (1907) 91° (1918) 0.12" NA
May 4 44° 66° 17° (1907) 94° (1918) 0.12" NA
May 5 45° 66° 26° (1944) 93° (1909) 0.12" NA
May 6 45° 67° 27° (1925) 96° (1934) 0.13" NA
May 7 46° 67° 2° (1931) 94° (1966) 0.13" NA
May 8 46° 68° 28° (1980) 98° (1934) 0.13" NA
May 9 47° 68° 28° (1915) 92° (1918) 0.13" NA
May 10 47° 68° 30° (1945) 90° (1911) 0.13" NA
May 11 48° 69° 27° (1946) 89° (1900) 0.13" NA
May 12 48° 69° 27° (1946) 94° (2000) 0.13" NA
May 13 48° 69° 27° (1910) 94° (1940) 0.13" NA
May 14 49° 70° 30° (1937) 94° (1915) 0.13" NA
May 15 49° 70° 28° (1983) 91° (1918) 0.13" NA
May 16 50° 70° 30° (1929) 92° (1936) 0.14" NA
May 17 50° 71° 31° (1912) 94° (1934) 0.14" NA
May 18 50° 71° 28° (1916) 97° (1934) 0.14" NA
May 19 51° 71° 30° (2002) 98° (1934) 0.14" NA
May 20 51° 72° 30° (1907) 97° (1934) 0.14" NA
May 21 51° 72° 30° (1931) 91° (1925) 0.14" NA
May 22 52° 73° 30° (1963) 95° (1925) 0.14" NA
May 23 52° 73° 30° (1963) 91° (1939) 0.14" NA
May 24 53° 73° 31° (1924) 99° (1939) 0.14" NA
May 25 53° 74° 29° (1925) 99° (1967) 0.14" NA
May 26 53° 74° 30° (1905) 93° (1967) 0.14" NA
May 27 54° 74° 32° (1907) 91° (1930) 0.14" NA
May 28 54° 75° 31° (1947) 94° (1934) 0.14" NA
May 29 54° 75° 28° (1947) 105° (1934) 0.14" NA
May 30 55° 75° 33° (1930) 105° (1934) 0.14" NA
May 31 55° 76° 40° (1905) 105° (1934) 0.14" NA
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