US Geography / US Weather / Illinois Weather / Oswego |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 28 | 34 | 45 | 58 | 71 | 81 | 84 | 82 | 75 | 64 | 48 | 34 |
| Avg. Low | 10 | 14 | 26 | 37 | 47 | 57 | 61 | 58 | 52 | 40 | 28 | 17 |
| Mean | 20 | 24 | 36 | 48 | 58 | 68 | 74 | 71 | 64 | 52 | 38 | 26 |
| Avg. Precip. | 1.6 in | 1.3 in | 2.6 in | 3.8 in | 3.8 in | 4.3 in | 4.1 in | 3.9 in | 3.8 in | 2.5 in | 2.8 in | 2.4 in |
Degrees in Fahrenheit
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