| 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. 1 - Oct. 10 | |
| 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: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06804 - Brookfield, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 27 | 36 | 46 | 55 | 60 | 59 | 51 | 39 | 31 | 22 | 39 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 59 | 71 | 79 | 84 | 82 | 73 | 63 | 51 | 40 | 60 |
| Avg Precip (In.) | 4.01 | 3.09 | 4.35 | 4.32 | 4.58 | 4.14 | 4.32 | 4.41 | 4.46 | 4.29 | 4.31 | 3.98 | 50.25 |