Elm Grove, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 13.8 °C (high). Annual precipitation averages 904.5 Millimeters. Elm Grove 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.6 °C | -1.8 °C | 43.69 mm |
| February | -8.9 °C | 0.2 °C | 41.66 mm |
| March | -3.8 °C | 6.2 °C | 50.8 mm |
| April | 2.1 °C | 13 °C | 98.55 mm |
| May | 8.1 °C | 19.6 °C | 101.6 mm |
| June | 13.7 °C | 25.2 °C | 121.92 mm |
| July | 16.6 °C | 27.8 °C | 95 mm |
| August | 15.8 °C | 27 °C | 94.74 mm |
| September | 11.2 °C | 23.1 °C | 80.77 mm |
| October | 4.9 °C | 16 °C | 71.37 mm |
| November | -1.2 °C | 7.9 °C | 53.09 mm |
| December | -6.9 °C | 1.2 °C | 51.31 mm |
| Annual | 3.4 °C | 13.8 °C | 904.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |