| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 59a - Connecticut Valley |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01337 - Bernardston, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 14 | 24 | 33 | 44 | 54 | 59 | 57 | 49 | 37 | 29 | 18 | 36 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 57 | 69 | 78 | 83 | 81 | 72 | 61 | 48 | 36 | 58 |
| Avg Precip (In.) | 3.84 | 3.04 | 3.94 | 3.95 | 4.24 | 3.99 | 3.97 | 3.65 | 3.76 | 3.98 | 4.06 | 3.71 | 46.12 |