| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 57a - Maumee Lake Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48073 - Royal Oak, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 48 | 58 | 63 | 61 | 53 | 42 | 33 | 23 | 40 |
| Avg Max Temp (°F) | 31 | 35 | 45 | 58 | 70 | 79 | 83 | 81 | 74 | 62 | 48 | 36 | 59 |
| Avg Precip (In.) | 1.86 | 1.73 | 2.45 | 3.07 | 2.87 | 3.3 | 3.15 | 3.22 | 3.24 | 2.4 | 2.69 | 2.44 | 32.43 |