| 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 7a: 0F to 5F | |
| 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: | 84a - Cape Cod and Islands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 02535 - Chilmark, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 23 | 30 | 38 | 47 | 56 | 63 | 62 | 55 | 45 | 37 | 27 | 42 |
| Avg Max Temp (°F) | 38 | 39 | 46 | 54 | 64 | 74 | 79 | 78 | 72 | 62 | 53 | 43 | 59 |
| Avg Precip (In.) | 4.23 | 3.42 | 4.41 | 4.24 | 3.62 | 3.52 | 3.11 | 3.89 | 3.68 | 4.03 | 4.24 | 4.28 | 46.68 |