US Geography / US Weather / Illinois Weather / Maryville |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 38 | 44 | 56 | 68 | 77 | 85 | 88 | 87 | 81 | 70 | 56 | 44 |
| Avg. Low | 20 | 24 | 34 | 44 | 52 | 61 | 65 | 62 | 55 | 44 | 35 | 25 |
| Mean | 30 | 34 | 45 | 56 | 65 | 74 | 77 | 75 | 68 | 58 | 46 | 34 |
| Avg. Precip. | 1.9 in | 2.3 in | 3.6 in | 3.4 in | 4.0 in | 3.7 in | 3.5 in | 3.4 in | 3.3 in | 2.8 in | 3.5 in | 3.3 in |
Degrees in Fahrenheit
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