| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59a - Connecticut Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01003 - Amherst, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 14 | 24 | 34 | 45 | 54 | 59 | 57 | 49 | 37 | 29 | 19 | 36 |
| Avg Max Temp (°F) | 34 | 37 | 46 | 58 | 70 | 78 | 83 | 81 | 73 | 62 | 50 | 38 | 59 |
| Avg Precip (In.) | 3.78 | 2.89 | 3.65 | 3.86 | 4.1 | 3.87 | 4.01 | 4.11 | 4.04 | 3.99 | 3.96 | 3.62 | 45.88 |