Hollis, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.2 °F (low) to 58.4 °F (high). Annual precipitation averages 47.8 Inches. Hollis is located in USDA Plant Hardiness Zone 6a. 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 | 14.4 °F | 33.3 °F | 3.47 in. |
| February | 16.0 °F | 36.1 °F | 3.26 in. |
| March | 23.9 °F | 44.0 °F | 4.14 in. |
| April | 34.4 °F | 57.0 °F | 4.04 in. |
| May | 45.2 °F | 68.1 °F | 3.79 in. |
| June | 54.5 °F | 77.1 °F | 4.38 in. |
| July | 60.0 °F | 82.5 °F | 3.75 in. |
| August | 58.1 °F | 80.8 °F | 3.84 in. |
| September | 50.4 °F | 73.5 °F | 4.01 in. |
| October | 38.7 °F | 60.7 °F | 4.84 in. |
| November | 29.5 °F | 49.4 °F | 3.85 in. |
| December | 20.8 °F | 38.6 °F | 4.41 in. |
| Annual | 37.2 °F | 58.4 °F | 47.78 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |