Comfrey, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.8 °F (low) to 55 °F (high). Annual precipitation averages 30.5 Inches. 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 | 5.5 °F | 23.1 °F | 0.74 in. |
| February | 9.6 °F | 27.6 °F | 0.85 in. |
| March | 21.7 °F | 39.8 °F | 1.67 in. |
| April | 34.0 °F | 55.9 °F | 3.04 in. |
| May | 46.9 °F | 68.8 °F | 4.24 in. |
| June | 57.9 °F | 78.6 °F | 4.81 in. |
| July | 61.4 °F | 82.1 °F | 3.69 in. |
| August | 58.5 °F | 79.8 °F | 3.56 in. |
| September | 49.7 °F | 73.7 °F | 3.17 in. |
| October | 37.0 °F | 59.6 °F | 2.39 in. |
| November | 23.9 °F | 42.5 °F | 1.31 in. |
| December | 12.0 °F | 28.4 °F | 1.04 in. |
| Annual | 34.8 °F | 55 °F | 30.51 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |