Leonard, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 28.5 °F (low) to 49.7 °F (high). Annual precipitation averages 24.9 Inches. 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 | -3.4 °F | 17.1 °F | 0.75 in. |
| February | -0.8 °F | 22.6 °F | 0.63 in. |
| March | 13.3 °F | 36.1 °F | 0.99 in. |
| April | 27.6 °F | 50.3 °F | 1.51 in. |
| May | 40.7 °F | 64.1 °F | 2.94 in. |
| June | 51.8 °F | 73.4 °F | 4.24 in. |
| July | 56.3 °F | 78.4 °F | 3.62 in. |
| August | 53.4 °F | 76.7 °F | 3.02 in. |
| September | 45.2 °F | 67.5 °F | 2.86 in. |
| October | 33.3 °F | 52.1 °F | 2.43 in. |
| November | 19.6 °F | 35.2 °F | 1.1 in. |
| December | 5.5 °F | 22.3 °F | 0.84 in. |
| Annual | 28.5 °F | 49.7 °F | 24.93 in. |
| 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 : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |