Oak Creek, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.6 °F (low) to 55.9 °F (high). Annual precipitation averages 36.6 Inches. Oak Creek is located in USDA Plant Hardiness Zone 6a. 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 | 15.8 °F | 29.8 °F | 1.83 in. |
| February | 18.4 °F | 32.7 °F | 1.73 in. |
| March | 27.2 °F | 42.5 °F | 2.15 in. |
| April | 37.3 °F | 52.8 °F | 4.25 in. |
| May | 47.8 °F | 64.1 °F | 4.3 in. |
| June | 58.3 °F | 74.5 °F | 4.58 in. |
| July | 64.5 °F | 80.3 °F | 3.43 in. |
| August | 63.8 °F | 79.1 °F | 3.67 in. |
| September | 55.9 °F | 72.6 °F | 3.26 in. |
| October | 43.9 °F | 60.3 °F | 3.11 in. |
| November | 32.3 °F | 46.9 °F | 2.34 in. |
| December | 21.9 °F | 35.0 °F | 1.99 in. |
| Annual | 40.6 °F | 55.9 °F | 36.64 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |