Milan, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 15 °C (high). Annual precipitation averages 887.7 Millimeters. Milan is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | -0.1 °C | 62.23 mm |
| February | -8.1 °C | 1.6 °C | 50.55 mm |
| March | -3.4 °C | 7.3 °C | 59.18 mm |
| April | 2.5 °C | 14.8 °C | 78.74 mm |
| May | 8.7 °C | 21.3 °C | 100.33 mm |
| June | 14 °C | 26.4 °C | 90.42 mm |
| July | 15.9 °C | 28.6 °C | 84.33 mm |
| August | 14.9 °C | 27.5 °C | 86.11 mm |
| September | 10.8 °C | 24 °C | 79.25 mm |
| October | 4.7 °C | 17 °C | 71.37 mm |
| November | -0.6 °C | 9.2 °C | 68.33 mm |
| December | -5.1 °C | 2.8 °C | 56.9 mm |
| Annual | 3.8 °C | 15 °C | 887.74 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |