Ossipee, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.4 °F (low) to 56.3 °F (high). Annual precipitation averages 49.4 Inches. Ossipee 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 | 10.4 °F | 29.9 °F | 3.35 in. |
| February | 10.9 °F | 32.8 °F | 3.36 in. |
| March | 20.2 °F | 41.6 °F | 3.81 in. |
| April | 31.6 °F | 54.9 °F | 4.2 in. |
| May | 42.9 °F | 67.7 °F | 3.85 in. |
| June | 52.4 °F | 75.9 °F | 4.4 in. |
| July | 57.6 °F | 81.1 °F | 4.46 in. |
| August | 56.1 °F | 79.8 °F | 3.97 in. |
| September | 48.2 °F | 71.8 °F | 3.89 in. |
| October | 37.3 °F | 58.4 °F | 5.32 in. |
| November | 27.5 °F | 45.8 °F | 4.21 in. |
| December | 17.7 °F | 35.4 °F | 4.59 in. |
| Annual | 34.4 °F | 56.3 °F | 49.41 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 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |