Oak Creek, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.8 °C (low) to 13.3 °C (high). Annual precipitation averages 930.7 Millimeters. 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 | -9 °C | -1.2 °C | 46.48 mm |
| February | -7.6 °C | 0.4 °C | 43.94 mm |
| March | -2.7 °C | 5.8 °C | 54.61 mm |
| April | 2.9 °C | 11.6 °C | 107.95 mm |
| May | 8.8 °C | 17.8 °C | 109.22 mm |
| June | 14.6 °C | 23.6 °C | 116.33 mm |
| July | 18.1 °C | 26.8 °C | 87.12 mm |
| August | 17.7 °C | 26.2 °C | 93.22 mm |
| September | 13.3 °C | 22.6 °C | 82.8 mm |
| October | 6.6 °C | 15.7 °C | 78.99 mm |
| November | 0.2 °C | 8.3 °C | 59.44 mm |
| December | -5.6 °C | 1.7 °C | 50.55 mm |
| Annual | 4.8 °C | 13.3 °C | 930.65 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |