Oak Grove, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 54.6 °F (high). Annual precipitation averages 34 Inches. Oak Grove 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 | 5.1 °F | 22.9 °F | 0.85 in. |
| February | 8.5 °F | 28.0 °F | 0.88 in. |
| March | 20.7 °F | 40.9 °F | 1.62 in. |
| April | 33.6 °F | 55.6 °F | 3.0 in. |
| May | 46.3 °F | 68.5 °F | 4.47 in. |
| June | 56.4 °F | 77.4 °F | 4.7 in. |
| July | 61.3 °F | 82.2 °F | 4.68 in. |
| August | 58.7 °F | 79.7 °F | 4.45 in. |
| September | 50.4 °F | 72.1 °F | 3.6 in. |
| October | 37.7 °F | 57.7 °F | 2.81 in. |
| November | 25.1 °F | 41.8 °F | 1.72 in. |
| December | 12.3 °F | 28.0 °F | 1.18 in. |
| Annual | 34.7 °F | 54.6 °F | 33.96 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 |