Haverhill, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 15.3 °C (high). Annual precipitation averages 1222 Millimeters. Haverhill is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.4 °C | 1.9 °C | 90.42 mm |
| February | -7.4 °C | 3.4 °C | 89.41 mm |
| March | -3.3 °C | 7.4 °C | 118.87 mm |
| April | 2.4 °C | 14.3 °C | 105.66 mm |
| May | 8.1 °C | 20 °C | 95.76 mm |
| June | 13.3 °C | 25.1 °C | 108.46 mm |
| July | 16.6 °C | 28.4 °C | 89.92 mm |
| August | 15.7 °C | 27.6 °C | 87.12 mm |
| September | 11.4 °C | 23.5 °C | 96.52 mm |
| October | 4.9 °C | 16.8 °C | 125.98 mm |
| November | -0.1 °C | 10.7 °C | 96.77 mm |
| December | -4.8 °C | 4.9 °C | 117.09 mm |
| Annual | 4 °C | 15.3 °C | 1221.98 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |