Dublin, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 12.5 °C (high). Annual precipitation averages 1344.9 Millimeters. Dublin is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.6 °C | -1.8 °C | 99.06 mm |
| February | -9.2 °C | 0.2 °C | 95.25 mm |
| March | -5.6 °C | 4.1 °C | 108.71 mm |
| April | 1.3 °C | 11.9 °C | 98.81 mm |
| May | 6.2 °C | 18.4 °C | 101.85 mm |
| June | 13.3 °C | 23 °C | 116.33 mm |
| July | 16.5 °C | 25.8 °C | 131.06 mm |
| August | 13.4 °C | 24.9 °C | 115.57 mm |
| September | 9.4 °C | 20.9 °C | 108.97 mm |
| October | 5.4 °C | 13.9 °C | 140.97 mm |
| November | -1.1 °C | 7.1 °C | 106.43 mm |
| December | -5.6 °C | 1.4 °C | 121.92 mm |
| Annual | 2.8 °C | 12.5 °C | 1344.93 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |