Northwood, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.9 °F (low) to 50.3 °F (high). Annual precipitation averages 22.3 Inches. Northwood is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.1 °F | 15.2 °F | 0.55 in. |
| February | 1.6 °F | 20.4 °F | 0.53 in. |
| March | 15.2 °F | 33.2 °F | 0.86 in. |
| April | 29.6 °F | 51.4 °F | 1.11 in. |
| May | 42.8 °F | 66.3 °F | 3.01 in. |
| June | 54.3 °F | 75.6 °F | 3.97 in. |
| July | 58.0 °F | 80.0 °F | 3.65 in. |
| August | 55.4 °F | 79.4 °F | 2.89 in. |
| September | 46.2 °F | 70.5 °F | 2.35 in. |
| October | 33.5 °F | 54.4 °F | 1.79 in. |
| November | 18.8 °F | 35.9 °F | 0.82 in. |
| December | 5.6 °F | 21.3 °F | 0.74 in. |
| Annual | 29.9 °F | 50.3 °F | 22.27 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |