Zolfo Springs, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.4 °C (low) to 28.8 °C (high). Annual precipitation averages 1385.6 Millimeters. Zolfo Springs is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.2 °C | 22.9 °C | 62.48 mm |
| February | 10.4 °C | 24.5 °C | 54.86 mm |
| March | 12.3 °C | 26.4 °C | 71.63 mm |
| April | 15.1 °C | 28.9 °C | 70.87 mm |
| May | 18.2 °C | 31.4 °C | 101.6 mm |
| June | 21.4 °C | 32.5 °C | 232.66 mm |
| July | 22.4 °C | 33.1 °C | 211.07 mm |
| August | 22.7 °C | 33.2 °C | 208.28 mm |
| September | 22.1 °C | 32.2 °C | 192.79 mm |
| October | 18.5 °C | 29.7 °C | 78.23 mm |
| November | 13.7 °C | 26.4 °C | 46.23 mm |
| December | 11.1 °C | 24.1 °C | 54.86 mm |
| Annual | 16.4 °C | 28.8 °C | 1385.56 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |