| 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: | 59a - Connecticut Valley |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06052 - New Britain, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 47 | 57 | 62 | 60 | 52 | 40 | 33 | 23 | 39 |
| Avg Max Temp (°F) | 35 | 38 | 47 | 58 | 70 | 78 | 84 | 81 | 73 | 62 | 51 | 40 | 60 |
| Avg Precip (In.) | 4.32 | 3.25 | 4.26 | 4.47 | 4.44 | 4.18 | 4.33 | 4.3 | 4.38 | 4.51 | 4.41 | 4.06 | 50.91 |