US Geography / US Weather / Illinois Weather / Joliet |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 28° | 34° | 45° | 58° | 71° | 81° | 84° | 82° | 76° | 64° | 48° | 34° |
| Avg. Low | 11° | 16° | 27° | 38° | 48° | 58° | 62° | 60° | 54° | 41° | 31° | 18° |
| Mean | 21° | 25° | 37° | 48° | 60° | 70° | 74° | 71° | 65° | 54° | 40° | 27° |
| Avg. Precip. | 1.4 in | 1.4 in | 2.7 in | 3.8 in | 3.8 in | 4.0 in | 4.0 in | 3.8 in | 3.7 in | 2.6 in | 2.8 in | 2.4 in |
Degrees in Fahrenheit
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