Grafton, WI
Climate overview — based on NOAA 1991-2020 normals from GRAFTON WWTP, WI US.
Year-round temperatures (°F)
Climate summary
Grafton has an annual average temperature of 47.8°F with about 35.5 inches of precipitation per year. The warmest month is July (average high 81.1°F), and the coldest is January (average low 17.0°F). June is typically the wettest month (4.50 in) and January the driest (1.58 in).
Best time to visit Grafton
Full guide →Climate change signal
All-time records →259 of 366 (70.8%) of Grafton's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 2000s | 12 | |
| 2010s | 218 | |
| 2020s | 136 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 30.0°F | 17.0°F | 23.5°F | 1.58 in | — | — |
| February | 33.1°F | 18.5°F | 25.8°F | 1.73 in | — | — |
| March | 42.7°F | 26.4°F | 34.5°F | 2.07 in | — | — |
| April | 54.1°F | 36.2°F | 45.2°F | 3.94 in | — | — |
| May | 65.7°F | 46.2°F | 55.9°F | 3.99 in | — | — |
| June | 75.5°F | 56.0°F | 65.7°F | 4.50 in | — | — |
| July | 81.1°F | 62.0°F | 71.5°F | 3.61 in | — | — |
| August | 79.8°F | 60.7°F | 70.2°F | 3.77 in | — | — |
| September | 72.5°F | 53.9°F | 63.2°F | 3.18 in | — | — |
| October | 60.5°F | 42.6°F | 51.5°F | 2.98 in | — | — |
| November | 46.4°F | 31.2°F | 38.8°F | 2.15 in | — | — |
| December | 35.2°F | 21.4°F | 28.3°F | 2.01 in | — | — |
Climate twins of Grafton
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).