Royal Oak, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 59.1 °F (high). Annual precipitation averages 34.1 Inches. Royal Oak is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.3 °F | 32.2 °F | 2.37 in. |
| February | 19.4 °F | 35.3 °F | 1.96 in. |
| March | 26.7 °F | 45.1 °F | 2.34 in. |
| April | 37.3 °F | 58.0 °F | 3.14 in. |
| May | 48.3 °F | 69.9 °F | 3.77 in. |
| June | 58.7 °F | 79.5 °F | 3.21 in. |
| July | 63.0 °F | 83.6 °F | 3.35 in. |
| August | 62.0 °F | 82.0 °F | 3.27 in. |
| September | 54.6 °F | 75.3 °F | 3.09 in. |
| October | 43.0 °F | 62.0 °F | 2.83 in. |
| November | 33.6 °F | 48.7 °F | 2.47 in. |
| December | 25.0 °F | 37.0 °F | 2.28 in. |
| Annual | 40.8 °F | 59.1 °F | 34.08 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |