Plato, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 12.4 °C (high). Annual precipitation averages 804.7 Millimeters. Plato is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.9 °C | -5.5 °C | 22.1 mm |
| February | -13.1 °C | -2.9 °C | 22.35 mm |
| March | -5.9 °C | 4 °C | 39.62 mm |
| April | 1.3 °C | 12.8 °C | 72.9 mm |
| May | 8.4 °C | 20.1 °C | 107.44 mm |
| June | 14.5 °C | 25.5 °C | 126.49 mm |
| July | 16.8 °C | 27.9 °C | 96.77 mm |
| August | 15.2 °C | 26.5 °C | 110.49 mm |
| September | 10.6 °C | 22.7 °C | 79.76 mm |
| October | 3.2 °C | 14.6 °C | 58.67 mm |
| November | -3.8 °C | 5.3 °C | 37.59 mm |
| December | -11 °C | -2.4 °C | 30.48 mm |
| Annual | 1.8 °C | 12.4 °C | 804.66 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |