Sanborn, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.9 °C (low) to 10.5 °C (high). Annual precipitation averages 547.9 Millimeters. Sanborn 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.9 °C | -8.3 °C | 13.21 mm |
| February | -15.8 °C | -5.4 °C | 12.95 mm |
| March | -9 °C | 1.3 °C | 21.59 mm |
| April | -1.3 °C | 10.7 °C | 31.24 mm |
| May | 5.9 °C | 18.9 °C | 80.26 mm |
| June | 12.3 °C | 24.1 °C | 93.98 mm |
| July | 14.6 °C | 27 °C | 86.61 mm |
| August | 12.9 °C | 26.4 °C | 65.79 mm |
| September | 7.8 °C | 21.3 °C | 61.47 mm |
| October | 0.6 °C | 12.6 °C | 46.48 mm |
| November | -7.3 °C | 2.8 °C | 16.76 mm |
| December | -13.8 °C | -5.1 °C | 17.53 mm |
| Annual | -0.9 °C | 10.5 °C | 547.87 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |