Myrtle Grove, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 59.5 °F (low) to 76.9 °F (high). Annual precipitation averages 67.7 Inches. Myrtle Grove is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.5 °F | 61.0 °F | 5.98 in. |
| February | 45.6 °F | 64.5 °F | 4.87 in. |
| March | 51.8 °F | 70.1 °F | 5.14 in. |
| April | 58.4 °F | 75.8 °F | 5.56 in. |
| May | 66.3 °F | 82.9 °F | 3.9 in. |
| June | 73.3 °F | 88.0 °F | 6.36 in. |
| July | 74.9 °F | 89.9 °F | 7.33 in. |
| August | 74.8 °F | 89.7 °F | 7.36 in. |
| September | 70.8 °F | 87.0 °F | 6.93 in. |
| October | 60.7 °F | 79.6 °F | 4.1 in. |
| November | 50.1 °F | 70.4 °F | 4.7 in. |
| December | 44.9 °F | 63.7 °F | 5.43 in. |
| Annual | 59.5 °F | 76.9 °F | 67.66 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |