Nelson, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.6 °F (low) to 51.6 °F (high). Annual precipitation averages 26.2 Inches. Nelson 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 | 1.2 °F | 18.9 °F | 0.63 in. |
| February | 4.7 °F | 23.8 °F | 0.52 in. |
| March | 17.4 °F | 36.2 °F | 1.13 in. |
| April | 31.7 °F | 52.3 °F | 2.08 in. |
| May | 45.2 °F | 65.9 °F | 3.19 in. |
| June | 55.9 °F | 75.5 °F | 4.3 in. |
| July | 60.5 °F | 80.1 °F | 4.03 in. |
| August | 57.7 °F | 78.3 °F | 3.32 in. |
| September | 49.0 °F | 70.1 °F | 2.62 in. |
| October | 35.7 °F | 54.9 °F | 2.55 in. |
| November | 22.4 °F | 38.1 °F | 1.02 in. |
| December | 9.2 °F | 24.7 °F | 0.77 in. |
| Annual | 32.6 °F | 51.6 °F | 26.16 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |