| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| 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: | 59b - Lower Worcester Plateau/Eastern Connecticut Upland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01331 - Athol, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 12 | 22 | 32 | 43 | 52 | 57 | 55 | 46 | 35 | 28 | 17 | 34 |
| Avg Max Temp (°F) | 32 | 35 | 45 | 57 | 70 | 78 | 83 | 81 | 72 | 60 | 48 | 36 | 58 |
| Avg Precip (In.) | 3.56 | 2.69 | 3.7 | 3.62 | 3.66 | 3.76 | 4.03 | 4.11 | 3.54 | 3.71 | 3.78 | 3.35 | 43.51 |