| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| 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: | 58o - Northern Connecticut Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03765 - Haverhill, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 5 | 17 | 29 | 41 | 50 | 55 | 53 | 44 | 33 | 25 | 11 | 31 |
| Avg Max Temp (°F) | 27 | 30 | 40 | 53 | 68 | 76 | 81 | 78 | 69 | 57 | 43 | 31 | 54 |
| Avg Precip (In.) | 2.63 | 1.88 | 2.36 | 2.4 | 3.21 | 3.79 | 3.69 | 3.98 | 3.52 | 3.35 | 3.07 | 2.45 | 36.34 |