Excelsior, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.2 °F (low) to 54.6 °F (high). Annual precipitation averages 31.9 Inches. Excelsior 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 | 6.0 °F | 22.7 °F | 0.88 in. |
| February | 9.4 °F | 27.4 °F | 0.89 in. |
| March | 21.9 °F | 40.0 °F | 1.57 in. |
| April | 35.4 °F | 55.3 °F | 2.82 in. |
| May | 48.3 °F | 68.3 °F | 4.21 in. |
| June | 58.7 °F | 77.9 °F | 4.64 in. |
| July | 63.1 °F | 82.4 °F | 4.11 in. |
| August | 60.8 °F | 80.2 °F | 4.36 in. |
| September | 52.6 °F | 72.8 °F | 3.26 in. |
| October | 39.3 °F | 58.1 °F | 2.44 in. |
| November | 26.4 °F | 41.9 °F | 1.49 in. |
| December | 13.0 °F | 27.8 °F | 1.27 in. |
| Annual | 36.2 °F | 54.6 °F | 31.94 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |