| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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 48094 - Washington, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 26 | 36 | 47 | 57 | 62 | 60 | 53 | 42 | 32 | 22 | 39 |
| Avg Max Temp (°F) | 31 | 34 | 44 | 57 | 69 | 78 | 83 | 81 | 73 | 61 | 47 | 35 | 58 |
| Avg Precip (In.) | 2.13 | 1.73 | 2.65 | 3.29 | 2.94 | 2.96 | 3.42 | 2.96 | 3.22 | 2.11 | 2.69 | 2.53 | 32.62 |