| 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. 11 - Oct. 20 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59c - Southern New England Coastal Plains and Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 02813 - Charlestown, RI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 30 | 38 | 47 | 56 | 63 | 62 | 55 | 44 | 36 | 27 | 42 |
| Avg Max Temp (°F) | 38 | 40 | 47 | 56 | 65 | 74 | 80 | 79 | 72 | 63 | 53 | 43 | 59 |
| Avg Precip (In.) | 4.27 | 3.45 | 4.5 | 4.3 | 3.75 | 3.4 | 3.03 | 3.79 | 3.78 | 3.65 | 4.5 | 4.19 | 46.63 |