Danbury, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 60.4 °F (high). Annual precipitation averages 51 Inches. Danbury is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.8 °F | 36.1 °F | 3.92 in. |
| February | 20.4 °F | 38.9 °F | 3.0 in. |
| March | 27.6 °F | 46.7 °F | 4.12 in. |
| April | 38.0 °F | 59.5 °F | 3.95 in. |
| May | 48.0 °F | 70.2 °F | 3.8 in. |
| June | 57.4 °F | 78.4 °F | 4.64 in. |
| July | 62.9 °F | 83.5 °F | 4.55 in. |
| August | 61.3 °F | 81.6 °F | 4.71 in. |
| September | 53.9 °F | 74.5 °F | 4.8 in. |
| October | 42.3 °F | 62.9 °F | 4.8 in. |
| November | 32.5 °F | 51.6 °F | 4.19 in. |
| December | 24.7 °F | 40.8 °F | 4.53 in. |
| Annual | 40.7 °F | 60.4 °F | 51.01 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |