Harmony, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35 °F (low) to 53.8 °F (high). Annual precipitation averages 36.3 Inches. 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 | 6.4 °F | 22.7 °F | 0.99 in. |
| February | 10.1 °F | 27.1 °F | 1.06 in. |
| March | 22.1 °F | 39.8 °F | 1.78 in. |
| April | 34.0 °F | 54.6 °F | 3.66 in. |
| May | 46.4 °F | 66.9 °F | 4.53 in. |
| June | 57.0 °F | 76.5 °F | 6.23 in. |
| July | 60.4 °F | 79.9 °F | 4.3 in. |
| August | 57.8 °F | 77.9 °F | 4.25 in. |
| September | 49.4 °F | 71.5 °F | 3.53 in. |
| October | 37.2 °F | 58.0 °F | 2.79 in. |
| November | 25.0 °F | 41.9 °F | 1.81 in. |
| December | 13.6 °F | 28.5 °F | 1.34 in. |
| Annual | 35 °F | 53.8 °F | 36.27 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |