Belmont, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 56.2 °F (high). Annual precipitation averages 46.6 Inches. Belmont is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.1 °F | 29.7 °F | 2.99 in. |
| February | 13.1 °F | 32.9 °F | 2.92 in. |
| March | 21.7 °F | 41.4 °F | 3.4 in. |
| April | 33.2 °F | 55.0 °F | 3.76 in. |
| May | 44.2 °F | 67.4 °F | 3.54 in. |
| June | 53.6 °F | 75.6 °F | 4.55 in. |
| July | 59.1 °F | 81.1 °F | 4.51 in. |
| August | 57.4 °F | 79.4 °F | 4.07 in. |
| September | 49.7 °F | 71.7 °F | 4.06 in. |
| October | 38.6 °F | 58.3 °F | 5.08 in. |
| November | 29.5 °F | 46.2 °F | 3.63 in. |
| December | 19.4 °F | 35.4 °F | 4.05 in. |
| Annual | 36 °F | 56.2 °F | 46.56 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |