Myrtle Grove, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.3 °C (low) to 24.9 °C (high). Annual precipitation averages 1718.6 Millimeters. 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 | 5.8 °C | 16.1 °C | 151.89 mm |
| February | 7.6 °C | 18.1 °C | 123.7 mm |
| March | 11 °C | 21.2 °C | 130.56 mm |
| April | 14.7 °C | 24.3 °C | 141.22 mm |
| May | 19.1 °C | 28.3 °C | 99.06 mm |
| June | 22.9 °C | 31.1 °C | 161.54 mm |
| July | 23.8 °C | 32.2 °C | 186.18 mm |
| August | 23.8 °C | 32.1 °C | 186.94 mm |
| September | 21.6 °C | 30.6 °C | 176.02 mm |
| October | 15.9 °C | 26.4 °C | 104.14 mm |
| November | 10.1 °C | 21.3 °C | 119.38 mm |
| December | 7.2 °C | 17.6 °C | 137.92 mm |
| Annual | 15.3 °C | 24.9 °C | 1718.55 mm |
| 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 : -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 |