Larson, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.7 °F (low) to 49.8 °F (high). Annual precipitation averages 16.8 Inches. Larson is located in USDA Plant Hardiness Zone 3b. 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 | -1.5 °F | 17.0 °F | 0.48 in. |
| February | 2.1 °F | 21.5 °F | 0.41 in. |
| March | 14.2 °F | 33.4 °F | 0.63 in. |
| April | 27.6 °F | 51.6 °F | 0.97 in. |
| May | 39.6 °F | 64.5 °F | 2.36 in. |
| June | 50.6 °F | 72.8 °F | 3.65 in. |
| July | 54.4 °F | 78.9 °F | 2.68 in. |
| August | 52.0 °F | 79.5 °F | 1.64 in. |
| September | 42.8 °F | 69.3 °F | 1.55 in. |
| October | 30.1 °F | 52.9 °F | 1.21 in. |
| November | 16.4 °F | 34.5 °F | 0.64 in. |
| December | 4.3 °F | 22.0 °F | 0.53 in. |
| Annual | 27.7 °F | 49.8 °F | 16.75 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 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |