Milton, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 14 °C (high). Annual precipitation averages 961.7 Millimeters. Milton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | -2.3 °C | 40.89 mm |
| February | -9.6 °C | -0.2 °C | 44.96 mm |
| March | -3.9 °C | 6.6 °C | 54.61 mm |
| April | 2.1 °C | 13.9 °C | 95.76 mm |
| May | 8.6 °C | 20.5 °C | 105.16 mm |
| June | 14.1 °C | 26.1 °C | 135.64 mm |
| July | 16.3 °C | 28 °C | 94.49 mm |
| August | 15.3 °C | 27.1 °C | 113.03 mm |
| September | 10.8 °C | 23.4 °C | 92.2 mm |
| October | 4.3 °C | 16.1 °C | 74.68 mm |
| November | -1.7 °C | 7.8 °C | 59.44 mm |
| December | -7.7 °C | 0.7 °C | 50.8 mm |
| Annual | 3.1 °C | 14 °C | 961.66 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |