| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°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 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 48170 - Plymouth, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 27 | 37 | 48 | 57 | 62 | 60 | 52 | 41 | 32 | 22 | 40 |
| Avg Max Temp (°F) | 31 | 35 | 45 | 58 | 71 | 80 | 84 | 82 | 74 | 62 | 48 | 36 | 59 |
| Avg Precip (In.) | 1.84 | 1.74 | 2.48 | 3.12 | 3.01 | 3.38 | 3.01 | 3.29 | 3.33 | 2.37 | 2.74 | 2.48 | 32.79 |