| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 59c - Southern New England Coastal Plains and Hills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06331 - Canterbury, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 27 | 36 | 46 | 55 | 61 | 59 | 51 | 39 | 32 | 22 | 38 |
| Avg Max Temp (°F) | 36 | 38 | 47 | 58 | 69 | 77 | 82 | 81 | 73 | 63 | 52 | 41 | 60 |
| Avg Precip (In.) | 4.51 | 3.47 | 4.5 | 4.41 | 4.04 | 3.7 | 4.02 | 4.34 | 4.16 | 4.41 | 4.62 | 4.31 | 50.48 |