| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 84a - Cape Cod and Islands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 02807 - Block Island, RI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 24 | 31 | 39 | 48 | 57 | 63 | 62 | 55 | 46 | 38 | 28 | 43 |
| Avg Max Temp (°F) | 39 | 40 | 46 | 54 | 63 | 72 | 78 | 78 | 71 | 62 | 53 | 44 | 58 |
| Avg Precip (In.) | 3.7 | 3.05 | 4 | 3.74 | 3.41 | 2.78 | 2.63 | 3.03 | 3.21 | 3.06 | 3.8 | 3.59 | 39.99 |