Bradford, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.9 °F (low) to 56.4 °F (high). Annual precipitation averages 50 Inches. Bradford is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.2 °F | 30.3 °F | 3.5 in. |
| February | 11.5 °F | 33.5 °F | 3.1 in. |
| March | 20.0 °F | 41.6 °F | 3.86 in. |
| April | 31.3 °F | 55.1 °F | 4.07 in. |
| May | 42.3 °F | 67.1 °F | 3.99 in. |
| June | 51.7 °F | 75.8 °F | 4.62 in. |
| July | 57.0 °F | 81.0 °F | 4.37 in. |
| August | 54.9 °F | 79.4 °F | 4.24 in. |
| September | 47.2 °F | 72.1 °F | 4.16 in. |
| October | 36.0 °F | 58.8 °F | 5.43 in. |
| November | 27.3 °F | 46.7 °F | 4.04 in. |
| December | 17.9 °F | 35.8 °F | 4.65 in. |
| Annual | 33.9 °F | 56.4 °F | 50.03 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |