Le Roy, 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 12.2 °C (high). Annual precipitation averages 906.3 Millimeters. Le Roy is located in USDA Plant Hardiness Zone 4b. 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 | -14.4 °C | -5.2 °C | 24.13 mm |
| February | -12.3 °C | -2.7 °C | 25.15 mm |
| March | -5.7 °C | 4.2 °C | 44.7 mm |
| April | 1 °C | 12.7 °C | 96.01 mm |
| May | 7.8 °C | 19.6 °C | 116.59 mm |
| June | 13.7 °C | 25.1 °C | 146.56 mm |
| July | 15.6 °C | 26.9 °C | 109.73 mm |
| August | 14.2 °C | 25.7 °C | 106.93 mm |
| September | 9.5 °C | 22.2 °C | 90.42 mm |
| October | 2.7 °C | 14.7 °C | 69.6 mm |
| November | -4.1 °C | 5.6 °C | 42.67 mm |
| December | -10.5 °C | -2 °C | 33.78 mm |
| Annual | 1.5 °C | 12.2 °C | 906.27 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |