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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