Osage, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 10 °C (high). Annual precipitation averages 680.5 Millimeters. Osage is located in USDA Plant Hardiness Zone 3b. 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 | -18.8 °C | -8.1 °C | 17.02 mm |
| February | -17.2 °C | -5.2 °C | 16.26 mm |
| March | -9.4 °C | 1.9 °C | 28.45 mm |
| April | -1.4 °C | 10.4 °C | 49.78 mm |
| May | 6.1 °C | 17.9 °C | 84.33 mm |
| June | 12.1 °C | 23.1 °C | 110.74 mm |
| July | 14.7 °C | 26.1 °C | 102.11 mm |
| August | 13.3 °C | 25 °C | 76.96 mm |
| September | 8.5 °C | 20.2 °C | 74.42 mm |
| October | 1.3 °C | 11.6 °C | 68.58 mm |
| November | -6.5 °C | 2.3 °C | 28.7 mm |
| December | -14.2 °C | -5.1 °C | 23.11 mm |
| Annual | -1 °C | 10 °C | 680.46 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |