Vernon, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 13.8 °C (high). Annual precipitation averages 916.7 Millimeters. Vernon 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 | -10.8 °C | -1.9 °C | 44.2 mm |
| February | -9.2 °C | 0.2 °C | 42.42 mm |
| March | -4.1 °C | 6.3 °C | 52.07 mm |
| April | 1.8 °C | 13.3 °C | 96.01 mm |
| May | 7.8 °C | 19.8 °C | 104.9 mm |
| June | 13.4 °C | 25.4 °C | 119.13 mm |
| July | 16.1 °C | 27.8 °C | 97.03 mm |
| August | 15.3 °C | 27 °C | 95 mm |
| September | 10.7 °C | 23.2 °C | 83.06 mm |
| October | 4.4 °C | 15.9 °C | 75.95 mm |
| November | -1.6 °C | 7.9 °C | 56.64 mm |
| December | -7.3 °C | 1.1 °C | 50.29 mm |
| Annual | 3 °C | 13.8 °C | 916.7 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |