Dayton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 12.5 °C (high). Annual precipitation averages 820.4 Millimeters. Dayton 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 | -14.8 °C | -5.2 °C | 20.32 mm |
| February | -12.9 °C | -2.4 °C | 21.34 mm |
| March | -6.2 °C | 4.7 °C | 39.62 mm |
| April | 0.7 °C | 12.9 °C | 73.41 mm |
| May | 7.9 °C | 20.3 °C | 109.22 mm |
| June | 13.7 °C | 25.5 °C | 115.06 mm |
| July | 16.5 °C | 28.2 °C | 109.73 mm |
| August | 14.9 °C | 26.7 °C | 103.63 mm |
| September | 10.3 °C | 22.4 °C | 89.66 mm |
| October | 3 °C | 14.1 °C | 68.58 mm |
| November | -3.8 °C | 5.4 °C | 40.89 mm |
| December | -10.8 °C | -2.3 °C | 28.96 mm |
| Annual | 1.5 °C | 12.5 °C | 820.42 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 |