Ashland, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.1 °F (low) to 56.2 °F (high). Annual precipitation averages 48.6 Inches. Ashland 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 | 10.7 °F | 29.6 °F | 3.23 in. |
| February | 11.6 °F | 32.7 °F | 2.94 in. |
| March | 20.8 °F | 41.3 °F | 3.6 in. |
| April | 32.6 °F | 54.8 °F | 3.88 in. |
| May | 43.7 °F | 67.5 °F | 3.95 in. |
| June | 53.0 °F | 76.0 °F | 4.46 in. |
| July | 58.3 °F | 81.2 °F | 4.74 in. |
| August | 56.4 °F | 79.6 °F | 4.08 in. |
| September | 49.0 °F | 72.1 °F | 3.96 in. |
| October | 37.9 °F | 58.5 °F | 5.39 in. |
| November | 28.8 °F | 46.0 °F | 4.03 in. |
| December | 18.7 °F | 35.2 °F | 4.35 in. |
| Annual | 35.1 °F | 56.2 °F | 48.61 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |