East Troy, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.4 °F (low) to 57 °F (high). Annual precipitation averages 36.7 Inches. East Troy is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.7 °F | 28.5 °F | 1.74 in. |
| February | 15.5 °F | 32.3 °F | 1.71 in. |
| March | 24.7 °F | 43.6 °F | 2.1 in. |
| April | 35.2 °F | 56.6 °F | 3.74 in. |
| May | 46.5 °F | 68.1 °F | 4.18 in. |
| June | 56.3 °F | 78.1 °F | 4.88 in. |
| July | 60.7 °F | 82.1 °F | 3.79 in. |
| August | 59.0 °F | 80.6 °F | 3.82 in. |
| September | 51.0 °F | 74.0 °F | 3.44 in. |
| October | 39.7 °F | 60.6 °F | 2.97 in. |
| November | 29.1 °F | 46.2 °F | 2.33 in. |
| December | 18.9 °F | 33.7 °F | 1.98 in. |
| Annual | 37.4 °F | 57 °F | 36.68 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |