Plaza, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.7 °C (low) to 10.5 °C (high). Annual precipitation averages 435.9 Millimeters. Plaza 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 | -17.8 °C | -7.7 °C | 11.18 mm |
| February | -15.7 °C | -5.1 °C | 10.92 mm |
| March | -9.2 °C | 1.7 °C | 16.26 mm |
| April | -2.2 °C | 11.3 °C | 24.89 mm |
| May | 4.7 °C | 18.2 °C | 65.79 mm |
| June | 10.6 °C | 22.9 °C | 91.44 mm |
| July | 13.1 °C | 26.6 °C | 62.74 mm |
| August | 11.7 °C | 26.8 °C | 47.75 mm |
| September | 6.4 °C | 21.1 °C | 43.69 mm |
| October | -0.2 °C | 12.2 °C | 31.75 mm |
| November | -7.7 °C | 2.4 °C | 16 mm |
| December | -14.1 °C | -4.9 °C | 13.46 mm |
| Annual | -1.7 °C | 10.5 °C | 435.87 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |