| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | May 1 - May 10 | |
| 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 01562 - Spencer, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 15 | 24 | 34 | 44 | 53 | 58 | 56 | 48 | 37 | 30 | 19 | 36 |
| Avg Max Temp (°F) | 32 | 35 | 43 | 55 | 67 | 75 | 80 | 78 | 70 | 59 | 48 | 37 | 57 |
| Avg Precip (In.) | 4 | 3.01 | 3.98 | 4.02 | 4.1 | 4.02 | 4.13 | 4.21 | 3.99 | 4.18 | 4.14 | 3.72 | 47.49 |