Myrtle, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.9 °F (low) to 72.3 °F (high). Annual precipitation averages 57.3 Inches. Myrtle is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.6 °F | 50.8 °F | 4.82 in. |
| February | 33.4 °F | 55.3 °F | 4.87 in. |
| March | 40.6 °F | 64.1 °F | 5.33 in. |
| April | 48.7 °F | 73.2 °F | 5.61 in. |
| May | 58.5 °F | 80.7 °F | 5.27 in. |
| June | 66.3 °F | 87.4 °F | 4.77 in. |
| July | 69.7 °F | 90.5 °F | 4.38 in. |
| August | 68.0 °F | 90.2 °F | 3.8 in. |
| September | 61.3 °F | 85.1 °F | 3.93 in. |
| October | 49.0 °F | 74.8 °F | 3.89 in. |
| November | 39.0 °F | 62.6 °F | 4.36 in. |
| December | 33.5 °F | 53.4 °F | 6.27 in. |
| Annual | 49.9 °F | 72.3 °F | 57.3 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |