Ypsilanti, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 15.2 °C (high). Annual precipitation averages 884.4 Millimeters. Ypsilanti 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 | -8.3 °C | 0.1 °C | 65.79 mm |
| February | -7.8 °C | 1.7 °C | 53.59 mm |
| March | -3.3 °C | 7.6 °C | 64.01 mm |
| April | 2.7 °C | 14.8 °C | 83.06 mm |
| May | 8.8 °C | 21.5 °C | 91.19 mm |
| June | 14.2 °C | 26.6 °C | 86.36 mm |
| July | 16.3 °C | 28.8 °C | 80.77 mm |
| August | 15.5 °C | 27.7 °C | 82.8 mm |
| September | 11.3 °C | 24.1 °C | 75.95 mm |
| October | 5.1 °C | 17 °C | 73.15 mm |
| November | -0.3 °C | 9.3 °C | 66.8 mm |
| December | -4.9 °C | 2.9 °C | 60.96 mm |
| Annual | 4.1 °C | 15.2 °C | 884.43 mm |
| 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 : -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 |