Souris, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.8 °C (low) to 9.6 °C (high). Annual precipitation averages 489.2 Millimeters. Souris 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 | -20.3 °C | -9.6 °C | 17.53 mm |
| February | -18.1 °C | -6.8 °C | 15.75 mm |
| March | -10.9 °C | 0 °C | 21.34 mm |
| April | -2.3 °C | 10.7 °C | 23.62 mm |
| May | 4.4 °C | 18.3 °C | 61.47 mm |
| June | 10.7 °C | 23.1 °C | 103.12 mm |
| July | 12.9 °C | 25.9 °C | 69.85 mm |
| August | 11.4 °C | 26.3 °C | 56.13 mm |
| September | 6.1 °C | 20.9 °C | 40.64 mm |
| October | -1.3 °C | 11.8 °C | 36.32 mm |
| November | -9.3 °C | 1.3 °C | 22.86 mm |
| December | -16.7 °C | -6.6 °C | 20.57 mm |
| Annual | -2.8 °C | 9.6 °C | 489.2 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |