Ann Arbor, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.6 °C (low) to 14.7 °C (high). Annual precipitation averages 900.2 Millimeters. Ann Arbor 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 | -8.8 °C | -0.3 °C | 66.04 mm |
| February | -8.3 °C | 1.4 °C | 54.1 mm |
| March | -3.9 °C | 7.2 °C | 65.28 mm |
| April | 2.2 °C | 14.4 °C | 84.84 mm |
| May | 8.3 °C | 21.2 °C | 92.71 mm |
| June | 13.7 °C | 26 °C | 90.68 mm |
| July | 15.7 °C | 28.3 °C | 84.84 mm |
| August | 15.1 °C | 27.2 °C | 83.57 mm |
| September | 10.8 °C | 23.6 °C | 75.44 mm |
| October | 4.6 °C | 16.6 °C | 73.66 mm |
| November | -0.7 °C | 8.9 °C | 66.8 mm |
| December | -5.4 °C | 2.4 °C | 62.23 mm |
| Annual | 3.6 °C | 14.7 °C | 900.19 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 |