Diamondhead, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.3 °C (low) to 24.9 °C (high). Annual precipitation averages 1718.3 Millimeters. Diamondhead is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °C | 15.9 °C | 147.57 mm |
| February | 6.5 °C | 17.9 °C | 112.78 mm |
| March | 10.2 °C | 21.5 °C | 138.43 mm |
| April | 13.7 °C | 24.5 °C | 150.11 mm |
| May | 18.3 °C | 28.4 °C | 138.94 mm |
| June | 21.7 °C | 31.5 °C | 174.5 mm |
| July | 22.9 °C | 32.3 °C | 197.61 mm |
| August | 22.7 °C | 32.4 °C | 174.5 mm |
| September | 20.7 °C | 30.8 °C | 148.34 mm |
| October | 14.8 °C | 26.3 °C | 92.71 mm |
| November | 8.8 °C | 20.9 °C | 114.3 mm |
| December | 5.8 °C | 16.9 °C | 128.52 mm |
| Annual | 14.3 °C | 24.9 °C | 1718.31 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |