US Geography / US Weather / Illinois Weather / Harvard |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 26 | 31 | 44 | 58 | 71 | 81 | 84 | 82 | 74 | 62 | 46 | 32 |
| Avg. Low | 7 | 11 | 24 | 35 | 45 | 55 | 60 | 58 | 48 | 38 | 27 | 14 |
| Mean | 17 | 22 | 34 | 47 | 58 | 68 | 74 | 70 | 62 | 51 | 37 | 24 |
| Avg. Precip. | 1.5 in | 1.1 in | 2.4 in | 3.6 in | 3.5 in | 4.4 in | 4.0 in | 4.3 in | 3.9 in | 2.7 in | 2.7 in | 2.1 in |
Degrees in Fahrenheit
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