Leonard, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.9 °C (low) to 9.8 °C (high). Annual precipitation averages 633.2 Millimeters. Leonard is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.7 °C | -8.3 °C | 19.05 mm |
| February | -18.2 °C | -5.2 °C | 16 mm |
| March | -10.4 °C | 2.3 °C | 25.15 mm |
| April | -2.4 °C | 10.2 °C | 38.35 mm |
| May | 4.8 °C | 17.8 °C | 74.68 mm |
| June | 11 °C | 23 °C | 107.7 mm |
| July | 13.5 °C | 25.8 °C | 91.95 mm |
| August | 11.9 °C | 24.8 °C | 76.71 mm |
| September | 7.3 °C | 19.7 °C | 72.64 mm |
| October | 0.7 °C | 11.2 °C | 61.72 mm |
| November | -6.9 °C | 1.8 °C | 27.94 mm |
| December | -14.7 °C | -5.4 °C | 21.34 mm |
| Annual | -1.9 °C | 9.8 °C | 633.23 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |