Williston, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.8 °C (low) to 27.7 °C (high). Annual precipitation averages 1414 Millimeters. Williston is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.2 °C | 20.2 °C | 92.71 mm |
| February | 8.1 °C | 22.2 °C | 75.18 mm |
| March | 10.1 °C | 24.8 °C | 100.08 mm |
| April | 13.4 °C | 27.8 °C | 71.63 mm |
| May | 17.3 °C | 31.3 °C | 83.31 mm |
| June | 21.3 °C | 32.9 °C | 209.8 mm |
| July | 22.2 °C | 33.2 °C | 187.96 mm |
| August | 22.3 °C | 32.9 °C | 217.17 mm |
| September | 21.1 °C | 32.1 °C | 164.08 mm |
| October | 16.3 °C | 28.9 °C | 78.99 mm |
| November | 10.8 °C | 24.6 °C | 52.83 mm |
| December | 7.9 °C | 21.4 °C | 80.26 mm |
| Annual | 14.8 °C | 27.7 °C | 1414 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |