| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 53d - Lake Michigan Lacustrine Clay Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53070 - Oostburg, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 26 | 36 | 45 | 55 | 62 | 61 | 53 | 42 | 30 | 19 | 38 |
| Avg Max Temp (°F) | 27 | 32 | 41 | 52 | 64 | 75 | 80 | 79 | 71 | 59 | 44 | 32 | 55 |
| Avg Precip (In.) | 1.62 | 1.27 | 2.17 | 3.09 | 2.98 | 3.47 | 3.44 | 4.11 | 3.48 | 2.52 | 2.43 | 1.85 | 32.42 |