US Geography / US Weather / Illinois Weather / Dekalb |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 26° | 31° | 44° | 58° | 70° | 80° | 84° | 81° | 74° | 62° | 46° | 31° |
| Avg. Low | 8° | 12° | 25° | 36° | 47° | 57° | 62° | 58° | 51° | 40° | 28° | 16° |
| Mean | 18° | 22° | 35° | 48° | 58° | 68° | 74° | 71° | 64° | 52° | 37° | 24° |
| Avg. Precip. | 1.5 in | 1.3 in | 2.4 in | 3.6 in | 3.7 in | 4.3 in | 4.4 in | 4.0 in | 3.9 in | 2.6 in | 2.9 in | 2.1 in |
Degrees in Fahrenheit
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