| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59h - Gulf of Maine Coastal Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03031 - Amherst, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 14 | 23 | 33 | 44 | 53 | 58 | 56 | 48 | 36 | 29 | 18 | 35 |
| Avg Max Temp (°F) | 33 | 36 | 44 | 56 | 69 | 77 | 82 | 80 | 72 | 61 | 48 | 37 | 58 |
| Avg Precip (In.) | 3.72 | 2.97 | 3.81 | 3.83 | 3.64 | 3.59 | 3.65 | 3.66 | 3.42 | 4.08 | 4.13 | 3.76 | 44.26 |