Oklee, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.9 °C (low) to 9.7 °C (high). Annual precipitation averages 620.3 Millimeters. Oklee 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 | -20.1 °C | -9.6 °C | 17.27 mm |
| February | -18.3 °C | -6.7 °C | 16 mm |
| March | -10.3 °C | 0.9 °C | 23.11 mm |
| April | -1.7 °C | 10.5 °C | 34.54 mm |
| May | 5.4 °C | 18.6 °C | 77.47 mm |
| June | 11.8 °C | 23.6 °C | 104.39 mm |
| July | 13.6 °C | 26.1 °C | 88.39 mm |
| August | 12.1 °C | 25.7 °C | 79.5 mm |
| September | 7.1 °C | 20.3 °C | 77.47 mm |
| October | 0.5 °C | 11.8 °C | 56.39 mm |
| November | -7.5 °C | 1.7 °C | 23.37 mm |
| December | -15.2 °C | -6.2 °C | 22.35 mm |
| Annual | -1.9 °C | 9.7 °C | 620.25 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 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |