Holly Hill, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.2 °C (low) to 26.6 °C (high). Annual precipitation averages 1268.7 Millimeters. Holly Hill is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.1 °C | 20.1 °C | 79.5 mm |
| February | 10.6 °C | 21.3 °C | 63.75 mm |
| March | 12.9 °C | 23.5 °C | 77.98 mm |
| April | 16.1 °C | 26.3 °C | 64.52 mm |
| May | 19.4 °C | 29 °C | 86.87 mm |
| June | 22.4 °C | 31 °C | 155.19 mm |
| July | 23.4 °C | 32.2 °C | 139.7 mm |
| August | 23.7 °C | 32 °C | 149.1 mm |
| September | 22.9 °C | 30.6 °C | 180.34 mm |
| October | 19.4 °C | 28.1 °C | 134.11 mm |
| November | 14.7 °C | 24.3 °C | 74.68 mm |
| December | 11.2 °C | 21.3 °C | 62.99 mm |
| Annual | 17.2 °C | 26.6 °C | 1268.73 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 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |