Peterborough, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 56.9 °F (high). Annual precipitation averages 48.3 Inches. Peterborough is located in USDA Plant Hardiness Zone 5b. 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 °F | 31.5 °F | 3.51 in. |
| February | 13.7 °F | 34.5 °F | 3.27 in. |
| March | 22.0 °F | 42.5 °F | 4.07 in. |
| April | 33.0 °F | 55.9 °F | 3.84 in. |
| May | 44.0 °F | 67.0 °F | 3.8 in. |
| June | 53.1 °F | 75.9 °F | 4.44 in. |
| July | 58.4 °F | 80.9 °F | 4.03 in. |
| August | 56.8 °F | 79.3 °F | 4.09 in. |
| September | 49.1 °F | 72.0 °F | 4.16 in. |
| October | 37.9 °F | 59.2 °F | 5.04 in. |
| November | 28.6 °F | 47.6 °F | 3.83 in. |
| December | 19.2 °F | 36.9 °F | 4.25 in. |
| Annual | 35.7 °F | 56.9 °F | 48.33 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |