Gardena, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.7 °C (low) to 10 °C (high). Annual precipitation averages 482.6 Millimeters. Gardena is located in USDA Plant Hardiness Zone 3b. 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 | -20.1 °C | -9.2 °C | 14.22 mm |
| February | -18.1 °C | -6.4 °C | 13.46 mm |
| March | -10.7 °C | 0.5 °C | 19.3 mm |
| April | -2.3 °C | 11.1 °C | 23.88 mm |
| May | 4.6 °C | 18.7 °C | 62.23 mm |
| June | 10.8 °C | 23.6 °C | 100.58 mm |
| July | 13 °C | 26.5 °C | 73.66 mm |
| August | 11.5 °C | 26.6 °C | 59.69 mm |
| September | 6.1 °C | 21.2 °C | 40.89 mm |
| October | -1.3 °C | 12 °C | 36.07 mm |
| November | -9.3 °C | 1.6 °C | 20.83 mm |
| December | -16.5 °C | -6.3 °C | 17.78 mm |
| Annual | -2.7 °C | 10 °C | 482.59 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 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |