Osakis, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.5 °F (low) to 52 °F (high). Annual precipitation averages 26.4 Inches. Osakis is located in USDA Plant Hardiness Zone 4b. 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 | 1.5 °F | 19.4 °F | 0.59 in. |
| February | 5.1 °F | 24.5 °F | 0.53 in. |
| March | 17.8 °F | 36.8 °F | 1.18 in. |
| April | 31.8 °F | 52.8 °F | 2.2 in. |
| May | 44.9 °F | 66.2 °F | 3.18 in. |
| June | 55.6 °F | 75.9 °F | 4.32 in. |
| July | 60.2 °F | 80.6 °F | 3.92 in. |
| August | 57.3 °F | 78.5 °F | 3.36 in. |
| September | 48.7 °F | 70.4 °F | 2.72 in. |
| October | 35.6 °F | 55.2 °F | 2.56 in. |
| November | 22.4 °F | 38.5 °F | 1.07 in. |
| December | 9.4 °F | 25.0 °F | 0.78 in. |
| Annual | 32.5 °F | 52 °F | 26.41 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |