North Walpole, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.5 °F (low) to 57 °F (high). Annual precipitation averages 43 Inches. North Walpole 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 | 11.1 °F | 30.6 °F | 3.16 in. |
| February | 12.2 °F | 34.1 °F | 2.62 in. |
| March | 21.2 °F | 42.1 °F | 3.3 in. |
| April | 33.0 °F | 55.3 °F | 3.27 in. |
| May | 44.2 °F | 67.8 °F | 3.5 in. |
| June | 53.9 °F | 76.6 °F | 3.9 in. |
| July | 59.1 °F | 81.8 °F | 4.06 in. |
| August | 57.1 °F | 80.4 °F | 3.79 in. |
| September | 49.4 °F | 73.0 °F | 3.78 in. |
| October | 37.5 °F | 59.5 °F | 4.52 in. |
| November | 28.3 °F | 47.1 °F | 3.37 in. |
| December | 18.8 °F | 35.7 °F | 3.77 in. |
| Annual | 35.5 °F | 57 °F | 43.04 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 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |