Springfield, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.6 °C (low) to 11.9 °C (high). Annual precipitation averages 1195.1 Millimeters. Springfield is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.9 °C | -2.8 °C | 80.77 mm |
| February | -11.3 °C | -1.1 °C | 72.64 mm |
| March | -6.6 °C | 3.7 °C | 86.87 mm |
| April | 0.2 °C | 11.2 °C | 93.98 mm |
| May | 6.3 °C | 18.4 °C | 94.74 mm |
| June | 11.8 °C | 22.8 °C | 114.3 mm |
| July | 14.4 °C | 25.3 °C | 113.54 mm |
| August | 13.3 °C | 24.5 °C | 105.41 mm |
| September | 9.4 °C | 20.5 °C | 100.58 mm |
| October | 3.4 °C | 13.4 °C | 135.38 mm |
| November | -2.1 °C | 6.6 °C | 94.74 mm |
| December | -7.6 °C | 0.3 °C | 102.11 mm |
| Annual | 1.6 °C | 11.9 °C | 1195.06 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |