Madison, New Hampshire has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 0.9 °C (low) to 13.1 °C (high). Annual precipitation averages 1320.6 Millimeters. Madison is located in USDA Plant Hardiness Zone 5a. 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 | -12.6 °C | -1.4 °C | 94.74 mm |
| February | -12.1 °C | 0.2 °C | 90.68 mm |
| March | -6.8 °C | 5 °C | 99.82 mm |
| April | -0.6 °C | 12.3 °C | 114.81 mm |
| May | 5.6 °C | 19.4 °C | 105.41 mm |
| June | 10.9 °C | 23.9 °C | 116.84 mm |
| July | 13.7 °C | 26.7 °C | 116.08 mm |
| August | 12.7 °C | 26.1 °C | 100.58 mm |
| September | 8.3 °C | 21.8 °C | 98.04 mm |
| October | 2.4 °C | 14.3 °C | 139.45 mm |
| November | -2.7 °C | 7.3 °C | 117.35 mm |
| December | -8.4 °C | 1.5 °C | 126.75 mm |
| Annual | 0.9 °C | 13.1 °C | 1320.55 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |