Cologne, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 12.6 °C (high). Annual precipitation averages 795.3 Millimeters. Cologne 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 | -14.7 °C | -5.2 °C | 20.57 mm |
| February | -12.7 °C | -2.6 °C | 21.59 mm |
| March | -5.8 °C | 4.4 °C | 39.62 mm |
| April | 1.7 °C | 13 °C | 70.36 mm |
| May | 8.8 °C | 20.3 °C | 108.71 mm |
| June | 14.6 °C | 25.5 °C | 119.13 mm |
| July | 16.9 °C | 28 °C | 98.04 mm |
| August | 15.6 °C | 26.8 °C | 109.22 mm |
| September | 11 °C | 22.8 °C | 79.76 mm |
| October | 3.6 °C | 14.7 °C | 60.2 mm |
| November | -3.4 °C | 5.5 °C | 38.1 mm |
| December | -10.8 °C | -2.3 °C | 29.97 mm |
| Annual | 2.1 °C | 12.6 °C | 795.27 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 |