Northwood, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.4 °F (low) to 60.8 °F (high). Annual precipitation averages 43.4 Inches. Northwood is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.8 °F | 35.9 °F | 3.0 in. |
| February | 20.8 °F | 38.8 °F | 2.58 in. |
| March | 27.5 °F | 47.6 °F | 3.45 in. |
| April | 37.9 °F | 61.2 °F | 3.8 in. |
| May | 48.1 °F | 71.3 °F | 4.12 in. |
| June | 57.4 °F | 79.3 °F | 4.18 in. |
| July | 61.6 °F | 83.7 °F | 3.91 in. |
| August | 60.0 °F | 82.2 °F | 3.89 in. |
| September | 52.9 °F | 75.2 °F | 4.33 in. |
| October | 41.5 °F | 63.2 °F | 3.79 in. |
| November | 32.2 °F | 51.0 °F | 3.03 in. |
| December | 25.1 °F | 40.1 °F | 3.29 in. |
| Annual | 40.4 °F | 60.8 °F | 43.37 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |