Milan, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 15.4 °C (high). Annual precipitation averages 1010.7 Millimeters. Milan is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 0.9 °C | 68.33 mm |
| February | -6.3 °C | 2.4 °C | 58.17 mm |
| March | -2.1 °C | 7.5 °C | 73.15 mm |
| April | 3.7 °C | 14.9 °C | 100.33 mm |
| May | 10.1 °C | 21.3 °C | 98.3 mm |
| June | 15.6 °C | 26.2 °C | 106.17 mm |
| July | 17.7 °C | 28.4 °C | 101.35 mm |
| August | 16.6 °C | 27.4 °C | 90.68 mm |
| September | 12.6 °C | 24.1 °C | 90.17 mm |
| October | 6.4 °C | 17.4 °C | 83.82 mm |
| November | 1.2 °C | 10 °C | 72.64 mm |
| December | -3.7 °C | 3.7 °C | 67.56 mm |
| Annual | 5.4 °C | 15.4 °C | 1010.67 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |