Bedford, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.7 °C (low) to 14.6 °C (high). Annual precipitation averages 1144.5 Millimeters. Bedford is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.3 °C | 0.4 °C | 79.5 mm |
| February | -9.4 °C | 2.1 °C | 77.47 mm |
| March | -4.9 °C | 6.5 °C | 93.73 mm |
| April | 1.2 °C | 13.9 °C | 96.01 mm |
| May | 7.3 °C | 20.1 °C | 91.69 mm |
| June | 12.5 °C | 25.1 °C | 106.43 mm |
| July | 15.6 °C | 27.9 °C | 93.22 mm |
| August | 14.5 °C | 27.1 °C | 93.22 mm |
| September | 10.3 °C | 23.1 °C | 96.01 mm |
| October | 3.8 °C | 15.8 °C | 118.36 mm |
| November | -1.4 °C | 9.4 °C | 93.47 mm |
| December | -6.7 °C | 3.4 °C | 105.41 mm |
| Annual | 2.7 °C | 14.6 °C | 1144.52 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |