Tower City, 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 573.5 Millimeters. Tower City 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 | -18.2 °C | -8.2 °C | 13.97 mm |
| February | -16.1 °C | -5.4 °C | 13.97 mm |
| March | -8.8 °C | 1.5 °C | 23.11 mm |
| April | -1 °C | 11.4 °C | 29.21 mm |
| May | 6.2 °C | 19.5 °C | 80.26 mm |
| June | 12.7 °C | 24.7 °C | 106.43 mm |
| July | 14.6 °C | 27.3 °C | 87.63 mm |
| August | 13.1 °C | 26.7 °C | 66.55 mm |
| September | 8 °C | 21.9 °C | 65.02 mm |
| October | 1 °C | 13.2 °C | 51.05 mm |
| November | -6.9 °C | 3.3 °C | 18.29 mm |
| December | -13.8 °C | -4.8 °C | 18.03 mm |
| Annual | -0.8 °C | 10.9 °C | 573.52 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 |