US Geography / US Weather / Illinois Weather / Monmouth |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 31 | 36 | 48 | 64 | 74 | 84 | 86 | 84 | 77 | 65 | 50 | 35 |
| Avg. Low | 14 | 18 | 28 | 40 | 50 | 58 | 64 | 61 | 54 | 42 | 31 | 18 |
| Mean | 22 | 27 | 38 | 52 | 64 | 71 | 75 | 74 | 66 | 54 | 41 | 27 |
| Avg. Precip. | 1.5 in | 1.4 in | 3.0 in | 3.7 in | 3.8 in | 4.0 in | 4.4 in | 3.8 in | 4.0 in | 3.0 in | 2.4 in | 2.3 in |
Degrees in Fahrenheit
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