Milan, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.9 °C (low) to 12.8 °C (high). Annual precipitation averages 682.8 Millimeters. Milan is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.9 °C | -5.4 °C | 17.27 mm |
| February | -13.9 °C | -2.9 °C | 18.29 mm |
| March | -6.7 °C | 4 °C | 33.78 mm |
| April | 0.6 °C | 13.3 °C | 62.99 mm |
| May | 7.9 °C | 20.9 °C | 79.76 mm |
| June | 14 °C | 26.3 °C | 101.35 mm |
| July | 15.9 °C | 28.3 °C | 100.08 mm |
| August | 14.3 °C | 27.2 °C | 92.2 mm |
| September | 9.5 °C | 23.6 °C | 67.56 mm |
| October | 2.3 °C | 15.3 °C | 61.21 mm |
| November | -4.9 °C | 5.7 °C | 28.7 mm |
| December | -11.9 °C | -2.3 °C | 19.56 mm |
| Annual | 0.9 °C | 12.8 °C | 682.75 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |