Hales Corners, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38 °F (low) to 56.9 °F (high). Annual precipitation averages 36.9 Inches. Hales Corners is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.0 °F | 28.9 °F | 1.82 in. |
| February | 16.0 °F | 32.5 °F | 1.72 in. |
| March | 25.1 °F | 43.1 °F | 2.04 in. |
| April | 35.6 °F | 55.4 °F | 4.01 in. |
| May | 46.4 °F | 67.2 °F | 4.24 in. |
| June | 56.5 °F | 77.2 °F | 5.0 in. |
| July | 61.7 °F | 82.0 °F | 3.65 in. |
| August | 60.2 °F | 80.7 °F | 3.83 in. |
| September | 52.0 °F | 73.7 °F | 3.35 in. |
| October | 40.5 °F | 60.9 °F | 2.92 in. |
| November | 29.6 °F | 46.4 °F | 2.21 in. |
| December | 19.3 °F | 34.2 °F | 2.08 in. |
| Annual | 38 °F | 56.9 °F | 36.87 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |