| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 59e - Narragansett/Bristol Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 02777 - Swansea, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 29 | 38 | 48 | 57 | 63 | 62 | 54 | 44 | 35 | 26 | 42 |
| Avg Max Temp (°F) | 37 | 39 | 47 | 57 | 68 | 77 | 82 | 81 | 73 | 63 | 51 | 42 | 60 |
| Avg Precip (In.) | 4.48 | 3.6 | 4.46 | 4.31 | 3.69 | 3.56 | 3.61 | 4.21 | 3.95 | 3.95 | 4.52 | 4.41 | 48.75 |