Heathrow, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 61.5 °F (low) to 82.5 °F (high). Annual precipitation averages 56.3 Inches. Heathrow is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 47.3 °F | 70.4 °F | 2.97 in. |
| February | 49.9 °F | 73.2 °F | 2.49 in. |
| March | 53.8 °F | 77.7 °F | 3.48 in. |
| April | 59.2 °F | 82.8 °F | 3.04 in. |
| May | 65.5 °F | 87.8 °F | 3.83 in. |
| June | 71.3 °F | 90.7 °F | 8.14 in. |
| July | 73.1 °F | 92.1 °F | 7.6 in. |
| August | 73.5 °F | 91.9 °F | 8.5 in. |
| September | 71.7 °F | 89.4 °F | 7.37 in. |
| October | 65.0 °F | 84.3 °F | 4.05 in. |
| November | 56.4 °F | 77.4 °F | 2.27 in. |
| December | 50.7 °F | 72.7 °F | 2.6 in. |
| Annual | 61.5 °F | 82.5 °F | 56.34 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |