Harmony, 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 12.1 °C (high). Annual precipitation averages 921.3 Millimeters. Harmony is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.2 °C | -5.2 °C | 25.15 mm |
| February | -12.2 °C | -2.7 °C | 26.92 mm |
| March | -5.5 °C | 4.3 °C | 45.21 mm |
| April | 1.1 °C | 12.6 °C | 92.96 mm |
| May | 8 °C | 19.4 °C | 115.06 mm |
| June | 13.9 °C | 24.7 °C | 158.24 mm |
| July | 15.8 °C | 26.6 °C | 109.22 mm |
| August | 14.3 °C | 25.5 °C | 107.95 mm |
| September | 9.7 °C | 21.9 °C | 89.66 mm |
| October | 2.9 °C | 14.4 °C | 70.87 mm |
| November | -3.9 °C | 5.5 °C | 45.97 mm |
| December | -10.2 °C | -1.9 °C | 34.04 mm |
| Annual | 1.6 °C | 12.1 °C | 921.25 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |