| 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 | |
| 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: | 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 01036 - Hampden, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 26 | 36 | 46 | 54 | 60 | 58 | 50 | 39 | 31 | 21 | 38 |
| Avg Max Temp (°F) | 34 | 38 | 47 | 59 | 70 | 78 | 83 | 81 | 74 | 62 | 50 | 39 | 60 |
| Avg Precip (In.) | 3.94 | 3 | 4.09 | 4.21 | 4.24 | 4.08 | 4.15 | 4.17 | 4.1 | 4.16 | 4.15 | 3.84 | 48.12 |