US Geography / US Weather / Illinois Weather / Casey |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 34° | 38° | 52° | 65° | 74° | 84° | 86° | 84° | 78° | 66° | 52° | 38° |
| Avg. Low | 18° | 22° | 34° | 44° | 54° | 62° | 66° | 64° | 57° | 45° | 35° | 24° |
| Mean | 26° | 31° | 44° | 54° | 64° | 74° | 76° | 74° | 68° | 56° | 44° | 32° |
| Avg. Precip. | 2.0 in | 2.1 in | 3.4 in | 3.7 in | 4.1 in | 3.6 in | 4.6 in | 3.3 in | 3.3 in | 3.0 in | 3.5 in | 3.4 in |
Degrees in Fahrenheit
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