Leonidas, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.7 °F (low) to 49.4 °F (high). Annual precipitation averages 27.9 Inches. Leonidas is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °F | 17.4 °F | 0.9 in. |
| February | -0.4 °F | 23.3 °F | 0.72 in. |
| March | 12.8 °F | 36.1 °F | 1.05 in. |
| April | 26.6 °F | 49.8 °F | 1.85 in. |
| May | 39.1 °F | 63.5 °F | 2.98 in. |
| June | 49.6 °F | 72.9 °F | 4.22 in. |
| July | 54.3 °F | 77.5 °F | 4.15 in. |
| August | 51.8 °F | 75.7 °F | 3.32 in. |
| September | 44.2 °F | 67.0 °F | 3.47 in. |
| October | 32.8 °F | 52.0 °F | 2.67 in. |
| November | 19.4 °F | 34.9 °F | 1.42 in. |
| December | 5.7 °F | 22.5 °F | 1.11 in. |
| Annual | 27.7 °F | 49.4 °F | 27.86 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |