| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 56d - Michigan Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49090 - South Haven, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 30 | 39 | 48 | 58 | 64 | 63 | 56 | 46 | 36 | 26 | 42 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 53 | 64 | 73 | 77 | 76 | 71 | 61 | 48 | 37 | 56 |
| Avg Precip (In.) | 2.1 | 1.58 | 2.09 | 3.25 | 3.11 | 3.19 | 3.49 | 3.59 | 4.08 | 2.78 | 3.27 | 2.75 | 35.3 |