US Geography / US Weather / Iowa Weather / Denison |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 27 | 32 | 44 | 60 | 71 | 80 | 84 | 81 | 74 | 62 | 45 | 30 |
| Avg. Low | 8 | 14 | 25 | 37 | 48 | 58 | 64 | 60 | 51 | 40 | 26 | 14 |
| Mean | 18 | 24 | 35 | 48 | 60 | 70 | 74 | 71 | 64 | 51 | 36 | 22 |
| Avg. Precip. | 0.7 in | 0.8 in | 2.0 in | 2.7 in | 4.3 in | 4.3 in | 3.4 in | 3.6 in | 3.8 in | 2.3 in | 1.3 in | 1.0 in |
Degrees in Fahrenheit
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