Berlin, New Hampshire has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -0.5 °C (low) to 11.9 °C (high). Annual precipitation averages 1086.1 Millimeters. Berlin is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.9 °C | -3.1 °C | 68.58 mm |
| February | -14.4 °C | -1.3 °C | 62.23 mm |
| March | -8.7 °C | 3.4 °C | 75.95 mm |
| April | -1.5 °C | 10.8 °C | 86.61 mm |
| May | 4.7 °C | 18.3 °C | 91.95 mm |
| June | 9.8 °C | 23.2 °C | 106.43 mm |
| July | 12.6 °C | 25.8 °C | 103.63 mm |
| August | 11.6 °C | 24.9 °C | 100.08 mm |
| September | 7.2 °C | 21.1 °C | 83.82 mm |
| October | 1.6 °C | 13.6 °C | 125.48 mm |
| November | -3.7 °C | 6.3 °C | 87.38 mm |
| December | -10 °C | -0.2 °C | 93.98 mm |
| Annual | -0.5 °C | 11.9 °C | 1086.12 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |