Mary Esther, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.6 °C (low) to 24.5 °C (high). Annual precipitation averages 1693.9 Millimeters. Mary Esther 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 Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.9 °C | 15.8 °C | 158.24 mm |
| February | 7.7 °C | 17.3 °C | 135.13 mm |
| March | 11.3 °C | 20.4 °C | 125.48 mm |
| April | 15 °C | 23.3 °C | 158.75 mm |
| May | 19.3 °C | 27.7 °C | 85.09 mm |
| June | 23.2 °C | 30.7 °C | 147.83 mm |
| July | 24.1 °C | 31.8 °C | 174.5 mm |
| August | 23.9 °C | 31.4 °C | 199.64 mm |
| September | 21.9 °C | 30.4 °C | 144.02 mm |
| October | 16.4 °C | 26.5 °C | 119.13 mm |
| November | 10.4 °C | 21.2 °C | 110.49 mm |
| December | 7.5 °C | 17.3 °C | 135.64 mm |
| Annual | 15.6 °C | 24.5 °C | 1693.94 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| 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 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |