| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 59c - Southern New England Coastal Plains and Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 06877 - Ridgefield, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 20 | 28 | 36 | 46 | 55 | 61 | 60 | 52 | 41 | 33 | 23 | 39 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 60 | 71 | 79 | 84 | 81 | 73 | 62 | 50 | 39 | 60 |
| Avg Precip (In.) | 4.29 | 3.28 | 4.73 | 4.54 | 4.96 | 4.35 | 4.42 | 4.53 | 4.85 | 4.48 | 4.66 | 4.26 | 53.35 |