Nashua, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 52.5 °F (high). Annual precipitation averages 25.5 Inches. Nashua is located in USDA Plant Hardiness Zone 4a. 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 | 0.8 °F | 18.8 °F | 0.7 in. |
| February | 4.2 °F | 23.2 °F | 0.64 in. |
| March | 18.4 °F | 36.2 °F | 1.08 in. |
| April | 32.2 °F | 53.2 °F | 2.18 in. |
| May | 45.2 °F | 67.5 °F | 3.13 in. |
| June | 56.4 °F | 77.0 °F | 4.19 in. |
| July | 60.2 °F | 81.4 °F | 3.79 in. |
| August | 57.1 °F | 80.0 °F | 2.9 in. |
| September | 48.3 °F | 72.0 °F | 2.76 in. |
| October | 35.3 °F | 56.5 °F | 2.51 in. |
| November | 21.5 °F | 39.3 °F | 0.88 in. |
| December | 8.4 °F | 24.9 °F | 0.77 in. |
| Annual | 32.3 °F | 52.5 °F | 25.53 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 4a : -30°F to -25°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 |