Ridgefield, 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 59.2 °F (high). Annual precipitation averages 52.5 Inches. Ridgefield 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.5 °F | 35.1 °F | 4.15 in. |
| February | 20.2 °F | 38.3 °F | 3.08 in. |
| March | 27.3 °F | 46.2 °F | 4.3 in. |
| April | 38.2 °F | 58.5 °F | 4.09 in. |
| May | 48.1 °F | 68.7 °F | 3.89 in. |
| June | 57.3 °F | 76.8 °F | 4.68 in. |
| July | 62.7 °F | 81.9 °F | 4.36 in. |
| August | 61.3 °F | 80.1 °F | 4.92 in. |
| September | 54.1 °F | 73.1 °F | 5.0 in. |
| October | 42.7 °F | 61.6 °F | 5.02 in. |
| November | 33.3 °F | 50.6 °F | 4.28 in. |
| December | 24.8 °F | 40.0 °F | 4.68 in. |
| Annual | 40.7 °F | 59.2 °F | 52.45 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |