Hilliard, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.2 °C (low) to 26.5 °C (high). Annual precipitation averages 1306.6 Millimeters. Hilliard is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.2 °C | 18.2 °C | 93.47 mm |
| February | 6.8 °C | 20.1 °C | 83.31 mm |
| March | 9.7 °C | 23.3 °C | 95.5 mm |
| April | 13.2 °C | 26.8 °C | 79.76 mm |
| May | 17.3 °C | 30.2 °C | 76.71 mm |
| June | 21.1 °C | 32.5 °C | 176.02 mm |
| July | 22.4 °C | 33.6 °C | 164.08 mm |
| August | 22.6 °C | 33.1 °C | 181.36 mm |
| September | 20.7 °C | 31.1 °C | 148.34 mm |
| October | 15.4 °C | 27.1 °C | 92.46 mm |
| November | 9.8 °C | 22.6 °C | 46.74 mm |
| December | 6.7 °C | 19.3 °C | 68.83 mm |
| Annual | 14.2 °C | 26.5 °C | 1306.58 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |