Nashua, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 11.4 °C (high). Annual precipitation averages 648.5 Millimeters. 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 | -17.3 °C | -7.3 °C | 17.78 mm |
| February | -15.4 °C | -4.9 °C | 16.26 mm |
| March | -7.6 °C | 2.3 °C | 27.43 mm |
| April | 0.1 °C | 11.8 °C | 55.37 mm |
| May | 7.3 °C | 19.7 °C | 79.5 mm |
| June | 13.6 °C | 25 °C | 106.43 mm |
| July | 15.7 °C | 27.4 °C | 96.27 mm |
| August | 13.9 °C | 26.7 °C | 73.66 mm |
| September | 9.1 °C | 22.2 °C | 70.1 mm |
| October | 1.8 °C | 13.6 °C | 63.75 mm |
| November | -5.8 °C | 4.1 °C | 22.35 mm |
| December | -13.1 °C | -3.9 °C | 19.56 mm |
| Annual | 0.2 °C | 11.4 °C | 648.46 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |