Harlem, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 63.9 °F (low) to 84.2 °F (high). Annual precipitation averages 46.6 Inches. Harlem is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 52.0 °F | 74.4 °F | 1.94 in. |
| February | 54.3 °F | 77.4 °F | 1.74 in. |
| March | 57.0 °F | 80.4 °F | 2.42 in. |
| April | 61.8 °F | 84.4 °F | 2.48 in. |
| May | 66.6 °F | 88.0 °F | 3.91 in. |
| June | 71.6 °F | 90.3 °F | 7.41 in. |
| July | 72.9 °F | 91.6 °F | 6.52 in. |
| August | 73.5 °F | 91.5 °F | 7.77 in. |
| September | 72.8 °F | 89.8 °F | 6.17 in. |
| October | 68.0 °F | 85.8 °F | 3.02 in. |
| November | 60.5 °F | 80.2 °F | 1.63 in. |
| December | 55.7 °F | 76.4 °F | 1.56 in. |
| Annual | 63.9 °F | 84.2 °F | 46.57 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |