Flasher, North Dakota has a Humid Continental Mild Summer With Dry Winters climate (Köppen classification: Dwb). Average annual temperatures range from -0.7 °C (low) to 12.4 °C (high). Annual precipitation averages 453.1 Millimeters. Flasher is located in USDA Plant Hardiness Zone 4a. 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 | -15.8 °C | -4.8 °C | 12.19 mm |
| February | -13.5 °C | -2.3 °C | 13.21 mm |
| March | -7.6 °C | 4.5 °C | 14.73 mm |
| April | -1.4 °C | 12.6 °C | 32.26 mm |
| May | 5.2 °C | 19.3 °C | 67.82 mm |
| June | 11.1 °C | 24.5 °C | 84.07 mm |
| July | 13.9 °C | 28.4 °C | 77.22 mm |
| August | 12.7 °C | 28.2 °C | 51.05 mm |
| September | 7.3 °C | 22.7 °C | 39.37 mm |
| October | -0.1 °C | 13.7 °C | 33.78 mm |
| November | -7.3 °C | 4.6 °C | 16.51 mm |
| December | -13.1 °C | -2.3 °C | 10.92 mm |
| Annual | -0.7 °C | 12.4 °C | 453.13 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 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 | Dwb - Humid Continental Mild Summer With Dry Winters |