Vandalia, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 14.5 °C (high). Annual precipitation averages 1004.8 Millimeters. Vandalia is located in USDA Plant Hardiness Zone 6a. 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 | -8.2 °C | -0.6 °C | 70.87 mm |
| February | -7.1 °C | 1.2 °C | 54.86 mm |
| March | -2.8 °C | 7.1 °C | 59.44 mm |
| April | 3.3 °C | 14.1 °C | 89.15 mm |
| May | 9.7 °C | 20.6 °C | 106.43 mm |
| June | 14.8 °C | 25.7 °C | 104.14 mm |
| July | 16.8 °C | 27.9 °C | 98.81 mm |
| August | 15.9 °C | 26.9 °C | 104.9 mm |
| September | 11.7 °C | 23.6 °C | 86.36 mm |
| October | 5.4 °C | 16.3 °C | 94.23 mm |
| November | 0.2 °C | 8.6 °C | 73.41 mm |
| December | -4.7 °C | 2.2 °C | 62.23 mm |
| Annual | 4.6 °C | 14.5 °C | 1004.83 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |