| 2023 Hardiness Zone: | 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 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: | 58g - Worcester/Monadnock Plateau | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01475 - Winchendon, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 10 | 20 | 31 | 41 | 50 | 55 | 53 | 44 | 33 | 26 | 15 | 32 |
| Avg Max Temp (°F) | 31 | 34 | 43 | 55 | 68 | 76 | 81 | 78 | 70 | 59 | 47 | 35 | 56 |
| Avg Precip (In.) | 3.9 | 2.95 | 3.86 | 3.85 | 3.73 | 3.96 | 4.12 | 4.32 | 3.72 | 3.94 | 4.13 | 3.71 | 46.2 |