| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55a - Clayey High Lime Till Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48104 - Ann Arbor, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 48 | 58 | 62 | 61 | 53 | 42 | 33 | 22 | 40 |
| Avg Max Temp (°F) | 31 | 35 | 46 | 59 | 71 | 80 | 84 | 81 | 74 | 62 | 48 | 35 | 59 |
| Avg Precip (In.) | 1.99 | 1.86 | 2.58 | 3.22 | 3.05 | 3.37 | 3.07 | 3.52 | 3.38 | 2.42 | 2.88 | 2.63 | 33.98 |