| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| 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: | 59a - Connecticut Valley |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01063 - Northampton, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 15 | 24 | 34 | 45 | 54 | 59 | 57 | 49 | 37 | 30 | 20 | 36 |
| Avg Max Temp (°F) | 34 | 37 | 46 | 59 | 71 | 79 | 84 | 82 | 74 | 63 | 50 | 38 | 60 |
| Avg Precip (In.) | 3.72 | 2.89 | 3.72 | 3.85 | 4.11 | 3.78 | 4.05 | 4.12 | 3.84 | 3.9 | 3.94 | 3.45 | 45.35 |