Tamworth, New Hampshire has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 32.1 °F (low) to 54.4 °F (high). Annual precipitation averages 53.9 Inches. Tamworth is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.5 °F | 28.1 °F | 3.69 in. |
| February | 8.5 °F | 30.7 °F | 3.43 in. |
| March | 18.2 °F | 39.5 °F | 4.01 in. |
| April | 29.9 °F | 52.7 °F | 4.52 in. |
| May | 40.6 °F | 65.7 °F | 4.18 in. |
| June | 49.8 °F | 74.2 °F | 4.85 in. |
| July | 55.0 °F | 79.1 °F | 5.16 in. |
| August | 53.4 °F | 77.5 °F | 4.63 in. |
| September | 45.6 °F | 70.1 °F | 4.28 in. |
| October | 34.9 °F | 56.3 °F | 5.73 in. |
| November | 26.2 °F | 44.2 °F | 4.5 in. |
| December | 15.9 °F | 34.3 °F | 4.94 in. |
| Annual | 32.1 °F | 54.4 °F | 53.92 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |