Blanchard, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 10.6 °C (high). Annual precipitation averages 588.3 Millimeters. Blanchard 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 | -18.7 °C | -8.9 °C | 15.49 mm |
| February | -16.6 °C | -5.9 °C | 14.73 mm |
| March | -9.1 °C | 1.1 °C | 23.62 mm |
| April | -0.8 °C | 11.2 °C | 30.73 mm |
| May | 6.4 °C | 19.3 °C | 74.17 mm |
| June | 12.8 °C | 24.6 °C | 103.89 mm |
| July | 14.7 °C | 27.1 °C | 95.5 mm |
| August | 13 °C | 26.4 °C | 69.09 mm |
| September | 8.1 °C | 21.8 °C | 69.6 mm |
| October | 1.3 °C | 12.9 °C | 51.31 mm |
| November | -6.8 °C | 3 °C | 20.57 mm |
| December | -14.2 °C | -5.4 °C | 19.56 mm |
| Annual | -0.8 °C | 10.6 °C | 588.26 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 |