Hudson, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.2 °C (low) to 15.3 °C (high). Annual precipitation averages 1197.4 Millimeters. Hudson is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | 1.2 °C | 85.6 mm |
| February | -8.7 °C | 2.9 °C | 82.55 mm |
| March | -4.2 °C | 7.3 °C | 106.68 mm |
| April | 1.7 °C | 14.6 °C | 103.12 mm |
| May | 7.7 °C | 20.7 °C | 96.27 mm |
| June | 12.9 °C | 25.7 °C | 108.97 mm |
| July | 16.1 °C | 28.8 °C | 91.69 mm |
| August | 15.1 °C | 27.8 °C | 97.79 mm |
| September | 10.7 °C | 23.7 °C | 96.77 mm |
| October | 4 °C | 16.7 °C | 122.17 mm |
| November | -1.1 °C | 10.1 °C | 96.27 mm |
| December | -6 °C | 4.3 °C | 109.47 mm |
| Annual | 3.2 °C | 15.3 °C | 1197.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |