| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 75a - Gulf Coast Flatwoods |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 39520 - Bay Saint Louis, MS | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 42 | 50 | 57 | 64 | 70 | 73 | 72 | 68 | 57 | 49 | 42 | 57 |
| Avg Max Temp (°F) | 60 | 64 | 70 | 76 | 83 | 89 | 91 | 91 | 87 | 80 | 70 | 63 | 77 |
| Avg Precip (In.) | 6.3 | 5.36 | 6.34 | 4.96 | 5.49 | 5.21 | 6.55 | 5.89 | 5.74 | 3.18 | 4.94 | 5 | 64.95 |