US Geography / US Weather / Wisconsin Weather / Grafton |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 27 | 31 | 40 | 50 | 61 | 72 | 78 | 77 | 68 | 58 | 45 | 32 |
| Avg. Low | 11 | 15 | 25 | 34 | 44 | 54 | 60 | 58 | 52 | 41 | 30 | 17 |
| Mean | 18 | 24 | 34 | 44 | 54 | 64 | 68 | 68 | 61 | 50 | 38 | 25 |
| Avg. Precip. | 1.3 in | 1.0 in | 2.0 in | 3.0 in | 2.7 in | 3.1 in | 3.4 in | 3.8 in | 3.8 in | 2.4 in | 2.3 in | 2.0 in |
Degrees in Fahrenheit
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