Ann Arbor, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.5 °F (low) to 58.6 °F (high). Annual precipitation averages 35.4 Inches. 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 | 16.1 °F | 31.5 °F | 2.6 in. |
| February | 17.0 °F | 34.5 °F | 2.13 in. |
| March | 25.0 °F | 44.9 °F | 2.57 in. |
| April | 36.0 °F | 58.0 °F | 3.34 in. |
| May | 47.0 °F | 70.1 °F | 3.65 in. |
| June | 56.6 °F | 78.8 °F | 3.57 in. |
| July | 60.2 °F | 83.0 °F | 3.34 in. |
| August | 59.1 °F | 81.0 °F | 3.29 in. |
| September | 51.5 °F | 74.5 °F | 2.97 in. |
| October | 40.3 °F | 61.8 °F | 2.9 in. |
| November | 30.7 °F | 48.1 °F | 2.63 in. |
| December | 22.3 °F | 36.4 °F | 2.45 in. |
| Annual | 38.5 °F | 58.6 °F | 35.44 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |