Tappen, 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 10.9 °C (high). Annual precipitation averages 515.6 Millimeters. Tappen 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 | -17.3 °C | -7.3 °C | 11.43 mm |
| February | -15.1 °C | -4.8 °C | 11.43 mm |
| March | -8.6 °C | 2.2 °C | 17.78 mm |
| April | -1.3 °C | 11.3 °C | 33.02 mm |
| May | 5.8 °C | 18.5 °C | 74.93 mm |
| June | 11.9 °C | 23.7 °C | 92.2 mm |
| July | 14.6 °C | 27.2 °C | 87.63 mm |
| August | 13.1 °C | 26.6 °C | 59.94 mm |
| September | 7.8 °C | 21.6 °C | 53.85 mm |
| October | 0.7 °C | 12.8 °C | 41.91 mm |
| November | -7.2 °C | 3.3 °C | 15.75 mm |
| December | -13.7 °C | -4.4 °C | 15.75 mm |
| Annual | -0.8 °C | 10.9 °C | 515.62 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |