Osage, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.3 °F (low) to 50 °F (high). Annual precipitation averages 26.8 Inches. 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 | -1.8 °F | 17.5 °F | 0.67 in. |
| February | 1.1 °F | 22.6 °F | 0.64 in. |
| March | 15.0 °F | 35.4 °F | 1.12 in. |
| April | 29.5 °F | 50.8 °F | 1.96 in. |
| May | 42.9 °F | 64.3 °F | 3.32 in. |
| June | 53.7 °F | 73.6 °F | 4.36 in. |
| July | 58.4 °F | 78.9 °F | 4.02 in. |
| August | 55.9 °F | 77.0 °F | 3.03 in. |
| September | 47.3 °F | 68.3 °F | 2.93 in. |
| October | 34.4 °F | 52.8 °F | 2.7 in. |
| November | 20.3 °F | 36.1 °F | 1.13 in. |
| December | 6.5 °F | 22.8 °F | 0.91 in. |
| Annual | 30.3 °F | 50 °F | 26.79 in. |
| 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 : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |