Milroy, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.5 °C (low) to 12.8 °C (high). Annual precipitation averages 721.4 Millimeters. Milroy is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.9 °C | -5 °C | 17.53 mm |
| February | -12.8 °C | -2.5 °C | 19.56 mm |
| March | -5.9 °C | 4.2 °C | 38.35 mm |
| April | 0.9 °C | 13 °C | 71.88 mm |
| May | 8.2 °C | 20.4 °C | 95.5 mm |
| June | 14.3 °C | 26 °C | 110.49 mm |
| July | 16.3 °C | 28.2 °C | 91.69 mm |
| August | 14.7 °C | 26.8 °C | 85.85 mm |
| September | 9.8 °C | 23.2 °C | 80.01 mm |
| October | 2.6 °C | 15.2 °C | 54.1 mm |
| November | -4.6 °C | 5.6 °C | 33.78 mm |
| December | -11.2 °C | -2.1 °C | 22.61 mm |
| Annual | 1.5 °C | 12.8 °C | 721.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |