| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50ae - Mio Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49751 - Johannesburg, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 9 | 17 | 29 | 41 | 50 | 54 | 53 | 45 | 36 | 26 | 16 | 32 |
| Avg Max Temp (°F) | 26 | 29 | 39 | 53 | 68 | 76 | 80 | 78 | 69 | 57 | 42 | 30 | 54 |
| Avg Precip (In.) | 2.35 | 1.63 | 2.1 | 2.37 | 2.82 | 2.72 | 3.28 | 3.73 | 3.53 | 2.99 | 2.62 | 2.42 | 32.54 |