| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| 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 01550 - Southbridge, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 14 | 24 | 34 | 44 | 53 | 59 | 57 | 49 | 37 | 30 | 19 | 36 |
| Avg Max Temp (°F) | 33 | 36 | 45 | 56 | 68 | 77 | 81 | 79 | 71 | 61 | 49 | 38 | 58 |
| Avg Precip (In.) | 4.41 | 3.24 | 4.33 | 4.27 | 3.87 | 3.99 | 4.06 | 4.13 | 4.2 | 4.39 | 4.44 | 4.1 | 49.44 |