| 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 Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| 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: | 57b - Oak Openings |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48161 - Monroe, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 28 | 38 | 49 | 59 | 64 | 62 | 54 | 43 | 33 | 23 | 41 |
| Avg Max Temp (°F) | 31 | 34 | 44 | 56 | 68 | 78 | 83 | 81 | 74 | 61 | 48 | 36 | 58 |
| Avg Precip (In.) | 1.84 | 1.76 | 2.64 | 3.22 | 3.16 | 3.61 | 3.04 | 3.43 | 3.05 | 2.38 | 2.82 | 2.55 | 33.49 |