| 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: | 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: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06488 - Southbury, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 27 | 36 | 46 | 55 | 60 | 59 | 51 | 40 | 32 | 22 | 38 |
| Avg Max Temp (°F) | 35 | 38 | 47 | 59 | 70 | 78 | 83 | 81 | 73 | 62 | 51 | 40 | 60 |
| Avg Precip (In.) | 3.92 | 3 | 4.23 | 4.06 | 4.54 | 4.13 | 4.53 | 4.39 | 4.55 | 4.31 | 4.04 | 3.75 | 49.45 |