Fort Ransom, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 11.5 °C (high). Annual precipitation averages 562.1 Millimeters. Fort Ransom is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.5 °C | -7.3 °C | 14.22 mm |
| February | -15.6 °C | -4.5 °C | 14.73 mm |
| March | -8.4 °C | 2.6 °C | 24.64 mm |
| April | -0.9 °C | 11.9 °C | 34.04 mm |
| May | 6.6 °C | 19.7 °C | 78.49 mm |
| June | 12.9 °C | 25.2 °C | 100.58 mm |
| July | 14.9 °C | 27.7 °C | 82.8 mm |
| August | 13.4 °C | 26.9 °C | 59.44 mm |
| September | 8.1 °C | 22.3 °C | 65.28 mm |
| October | 0.9 °C | 13.6 °C | 53.09 mm |
| November | -6.8 °C | 3.8 °C | 17.27 mm |
| December | -13.3 °C | -3.8 °C | 17.53 mm |
| Annual | -0.5 °C | 11.5 °C | 562.11 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |