Oakley, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.6 °F (low) to 57.8 °F (high). Annual precipitation averages 32.9 Inches. Oakley is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.1 °F | 30.3 °F | 2.13 in. |
| February | 15.6 °F | 32.9 °F | 1.73 in. |
| March | 23.9 °F | 43.4 °F | 1.93 in. |
| April | 34.7 °F | 56.8 °F | 3.45 in. |
| May | 46.1 °F | 69.2 °F | 3.68 in. |
| June | 56.0 °F | 78.7 °F | 3.33 in. |
| July | 59.3 °F | 82.7 °F | 3.31 in. |
| August | 57.8 °F | 80.5 °F | 3.31 in. |
| September | 50.1 °F | 74.4 °F | 2.59 in. |
| October | 39.8 °F | 61.2 °F | 3.1 in. |
| November | 30.5 °F | 47.3 °F | 2.37 in. |
| December | 22.0 °F | 35.6 °F | 1.99 in. |
| Annual | 37.6 °F | 57.8 °F | 32.92 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |