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
Sep 1 57° 79° 39° (1949) 97° (1911) 0.11" NA
Sep 2 57° 78° 41° (1924) 96° (1937) 0.11" NA
Sep 3 57° 78° 34° (1974) 102° (2000) 0.11" NA
Sep 4 56° 78° 36° (1902) 96° (1913) 0.11" NA
Sep 5 56° 78° 36° (1962) 98° (1913) 0.11" NA
Sep 6 55° 77° 36° (1909) 103° (1939) 0.11" NA
Sep 7 55° 77° 38° (1934) 102° (1939) 0.11" NA
Sep 8 55° 77° 40° (1995) 97° (1947) 0.12" NA
Sep 9 54° 76° 38° (1943) 99° (1955) 0.12" NA
Sep 10 54° 76° 38° (1910) 97° (1931) 0.12" NA
Sep 11 53° 76° 37° (1959) 94° (1939) 0.12" NA
Sep 12 53° 76° 29° (1902) 97° (1939) 0.12" NA
Sep 13 53° 75° 29° (1902) 98° (1931) 0.11" NA
Sep 14 52° 75° 34° (1923) 99° (1939) 0.11" NA
Sep 15 52° 75° 32° (1916) 99° (1939) 0.11" NA
Sep 16 51° 74° 32° (1937) 98° (1931) 0.11" NA
Sep 17 51° 74° 30° (1900) 94° (1925) 0.11" NA
Sep 18 51° 74° 30° (1901) 97° (1947) 0.11" NA
Sep 19 50° 73° 29° (1991) 94° (1939) 0.11" NA
Sep 20 50° 73° 29° (1901) 92° (1940) 0.11" NA
Sep 21 50° 73° 21° (1918) 95° (1937) 0.11" NA
Sep 22 49° 73° 24° (1913) 96° (1937) 0.11" NA
Sep 23 49° 72° 30° (1916) 91° (1938) 0.11" NA
Sep 24 48° 72° 28° (1942) 90° (1930) 0.11" NA
Sep 25 48° 71° 28° (1926) 88° (1933) 0.11" NA
Sep 26 48° 71° 29° (1984) 89° (1956) 0.1" NA
Sep 27 47° 71° 27° (1942) 91° (1998) 0.1" NA
Sep 28 47° 70° 22° (1942) 93° (1953) 0.1" NA
Sep 29 47° 70° 24° (1908) 89° (1981) 0.1" NA
Sep 30 46° 70° 24° (1956) 88° (1952) 0.1" NA
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