Milan, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17.4 °C (high). Annual precipitation averages 1197.1 Millimeters. Milan is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.8 °C | 3.2 °C | 89.15 mm |
| February | -4.8 °C | 5.6 °C | 76.2 mm |
| March | 0.1 °C | 11.2 °C | 101.35 mm |
| April | 5.8 °C | 18.2 °C | 124.97 mm |
| May | 11.6 °C | 23.3 °C | 135.38 mm |
| June | 16.3 °C | 27.4 °C | 124.21 mm |
| July | 18.1 °C | 29.2 °C | 104.39 mm |
| August | 17.3 °C | 28.8 °C | 88.9 mm |
| September | 13.1 °C | 25.8 °C | 81.28 mm |
| October | 6.8 °C | 19.1 °C | 86.11 mm |
| November | 0.8 °C | 11.8 °C | 87.12 mm |
| December | -3.3 °C | 5.7 °C | 98.04 mm |
| Annual | 6.3 °C | 17.4 °C | 1197.1 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 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 |