Harlem, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.7 °C (low) to 29 °C (high). Annual precipitation averages 1182.9 Millimeters. Harlem is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.1 °C | 23.6 °C | 49.28 mm |
| February | 12.4 °C | 25.2 °C | 44.2 mm |
| March | 13.9 °C | 26.9 °C | 61.47 mm |
| April | 16.6 °C | 29.1 °C | 62.99 mm |
| May | 19.2 °C | 31.1 °C | 99.31 mm |
| June | 22 °C | 32.4 °C | 188.21 mm |
| July | 22.7 °C | 33.1 °C | 165.61 mm |
| August | 23.1 °C | 33.1 °C | 197.36 mm |
| September | 22.7 °C | 32.1 °C | 156.72 mm |
| October | 20 °C | 29.9 °C | 76.71 mm |
| November | 15.8 °C | 26.8 °C | 41.4 mm |
| December | 13.2 °C | 24.7 °C | 39.62 mm |
| Annual | 17.7 °C | 29 °C | 1182.88 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |