| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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: | 58c - Green Mountains/Berkshire Highlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01339 - Charlemont, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 11 | 22 | 32 | 42 | 52 | 56 | 54 | 47 | 36 | 28 | 17 | 34 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 54 | 67 | 76 | 80 | 78 | 70 | 59 | 46 | 34 | 56 |
| Avg Precip (In.) | 3.39 | 3.17 | 3.52 | 3.51 | 3.64 | 4.19 | 4.15 | 4.22 | 3.24 | 3.39 | 3.63 | 3.78 | 43.83 |