Bridgewater, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.1 °F (low) to 53.7 °F (high). Annual precipitation averages 52 Inches. Bridgewater is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.1 °F | 26.8 °F | 3.61 in. |
| February | 10.2 °F | 30.0 °F | 3.24 in. |
| March | 19.7 °F | 38.6 °F | 3.81 in. |
| April | 31.9 °F | 52.6 °F | 4.03 in. |
| May | 42.9 °F | 65.3 °F | 4.12 in. |
| June | 52.2 °F | 73.6 °F | 5.05 in. |
| July | 57.2 °F | 78.5 °F | 4.88 in. |
| August | 55.7 °F | 77.1 °F | 4.48 in. |
| September | 48.3 °F | 69.5 °F | 4.34 in. |
| October | 37.3 °F | 56.3 °F | 5.54 in. |
| November | 27.5 °F | 43.3 °F | 4.24 in. |
| December | 16.8 °F | 32.5 °F | 4.62 in. |
| Annual | 34.1 °F | 53.7 °F | 51.96 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |