| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | 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 11 - May 20 | |
| 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 01463 - Pepperell, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 16 | 25 | 34 | 45 | 53 | 59 | 57 | 48 | 37 | 30 | 19 | 36 |
| Avg Max Temp (°F) | 34 | 37 | 46 | 58 | 70 | 78 | 84 | 81 | 73 | 62 | 50 | 38 | 59 |
| Avg Precip (In.) | 3.98 | 3.12 | 3.99 | 3.96 | 3.65 | 3.78 | 3.62 | 3.69 | 3.75 | 4.08 | 4.3 | 3.85 | 45.77 |