Glendale, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.9 °F (low) to 56.9 °F (high). Annual precipitation averages 34.4 Inches. Glendale 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.5 °F | 30.1 °F | 1.65 in. |
| February | 18.1 °F | 33.3 °F | 1.62 in. |
| March | 26.9 °F | 43.1 °F | 1.92 in. |
| April | 36.7 °F | 54.6 °F | 3.98 in. |
| May | 47.1 °F | 66.6 °F | 3.85 in. |
| June | 57.4 °F | 76.5 °F | 4.55 in. |
| July | 63.2 °F | 81.6 °F | 3.44 in. |
| August | 62.6 °F | 80.2 °F | 3.41 in. |
| September | 54.8 °F | 73.4 °F | 3.17 in. |
| October | 43.2 °F | 60.9 °F | 2.82 in. |
| November | 31.6 °F | 47.1 °F | 2.08 in. |
| December | 21.6 °F | 35.3 °F | 1.93 in. |
| Annual | 39.9 °F | 56.9 °F | 34.42 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |