| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| 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 06840 - New Canaan, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 29 | 38 | 47 | 56 | 62 | 61 | 53 | 41 | 33 | 25 | 40 |
| Avg Max Temp (°F) | 37 | 40 | 49 | 61 | 72 | 80 | 85 | 82 | 75 | 64 | 52 | 41 | 61 |
| Avg Precip (In.) | 4.37 | 3.21 | 4.55 | 4.49 | 4.87 | 4.23 | 4.09 | 4.19 | 4.65 | 4.32 | 4.54 | 4.16 | 51.68 |