Danbury, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.4 °F (low) to 55 °F (high). Annual precipitation averages 47 Inches. Danbury is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.3 °F | 28.6 °F | 3.13 in. |
| February | 9.2 °F | 31.7 °F | 2.91 in. |
| March | 18.3 °F | 40.1 °F | 3.36 in. |
| April | 29.8 °F | 53.4 °F | 3.77 in. |
| May | 41.7 °F | 66.3 °F | 3.84 in. |
| June | 50.2 °F | 74.7 °F | 4.46 in. |
| July | 55.5 °F | 79.6 °F | 4.35 in. |
| August | 53.5 °F | 78.1 °F | 3.99 in. |
| September | 45.8 °F | 70.6 °F | 3.86 in. |
| October | 34.7 °F | 57.2 °F | 5.32 in. |
| November | 25.9 °F | 45.2 °F | 3.82 in. |
| December | 16.1 °F | 34.1 °F | 4.15 in. |
| Annual | 32.4 °F | 55 °F | 46.96 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |