Comfrey, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.6 °C (low) to 12.8 °C (high). Annual precipitation averages 775 Millimeters. Comfrey is located in USDA Plant Hardiness Zone 5a. 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 | -4.9 °C | 18.8 mm |
| February | -12.4 °C | -2.4 °C | 21.59 mm |
| March | -5.7 °C | 4.3 °C | 42.42 mm |
| April | 1.1 °C | 13.3 °C | 77.22 mm |
| May | 8.3 °C | 20.4 °C | 107.7 mm |
| June | 14.4 °C | 25.9 °C | 122.17 mm |
| July | 16.3 °C | 27.8 °C | 93.73 mm |
| August | 14.7 °C | 26.6 °C | 90.42 mm |
| September | 9.8 °C | 23.2 °C | 80.52 mm |
| October | 2.8 °C | 15.3 °C | 60.71 mm |
| November | -4.5 °C | 5.8 °C | 33.27 mm |
| December | -11.1 °C | -2 °C | 26.42 mm |
| Annual | 1.6 °C | 12.8 °C | 774.97 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |