Diamondhead, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.7 °F (low) to 76.9 °F (high). Annual precipitation averages 67.7 Inches. 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 | 40.9 °F | 60.6 °F | 5.81 in. |
| February | 43.7 °F | 64.2 °F | 4.44 in. |
| March | 50.3 °F | 70.7 °F | 5.45 in. |
| April | 56.7 °F | 76.1 °F | 5.91 in. |
| May | 64.9 °F | 83.1 °F | 5.47 in. |
| June | 71.1 °F | 88.7 °F | 6.87 in. |
| July | 73.2 °F | 90.1 °F | 7.78 in. |
| August | 72.9 °F | 90.4 °F | 6.87 in. |
| September | 69.2 °F | 87.4 °F | 5.84 in. |
| October | 58.7 °F | 79.3 °F | 3.65 in. |
| November | 47.9 °F | 69.6 °F | 4.5 in. |
| December | 42.5 °F | 62.5 °F | 5.06 in. |
| Annual | 57.7 °F | 76.9 °F | 67.65 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |