Antrim, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.8 °F (low) to 56.6 °F (high). Annual precipitation averages 49 Inches. Antrim 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 | 11.7 °F | 30.8 °F | 3.49 in. |
| February | 12.8 °F | 33.9 °F | 3.29 in. |
| March | 21.0 °F | 41.9 °F | 3.9 in. |
| April | 32.0 °F | 55.5 °F | 3.93 in. |
| May | 43.1 °F | 66.9 °F | 3.83 in. |
| June | 52.6 °F | 75.7 °F | 4.46 in. |
| July | 57.6 °F | 80.8 °F | 4.08 in. |
| August | 55.4 °F | 79.2 °F | 3.98 in. |
| September | 47.9 °F | 72.0 °F | 4.21 in. |
| October | 37.0 °F | 58.9 °F | 5.3 in. |
| November | 28.0 °F | 47.3 °F | 3.99 in. |
| December | 18.6 °F | 36.4 °F | 4.52 in. |
| Annual | 34.8 °F | 56.6 °F | 48.98 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |