| 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 Zone 7a: 0°F to 5°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: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 59a - Connecticut Valley |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06471 - North Branford, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 29 | 38 | 48 | 58 | 63 | 62 | 54 | 43 | 34 | 25 | 41 |
| Avg Max Temp (°F) | 36 | 39 | 47 | 58 | 69 | 78 | 83 | 81 | 73 | 63 | 51 | 41 | 60 |
| Avg Precip (In.) | 4.44 | 3.24 | 4.52 | 4.5 | 4.51 | 4.21 | 4.12 | 4.3 | 4.37 | 4.38 | 4.41 | 4.1 | 51.1 |