| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 59c - Southern New England Coastal Plains and Hills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06460 - Milford, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 24 | 31 | 40 | 50 | 59 | 65 | 64 | 57 | 45 | 37 | 27 | 43 |
| Avg Max Temp (°F) | 37 | 40 | 48 | 58 | 68 | 77 | 83 | 81 | 74 | 63 | 53 | 42 | 60 |
| Avg Precip (In.) | 3.91 | 3.01 | 4.25 | 4.14 | 4.21 | 3.71 | 3.93 | 3.89 | 3.81 | 3.75 | 3.87 | 3.66 | 46.15 |