Iona, Florida has a Tropical Savanna (Wet and Dry Climate) climate (Köppen classification: Aw). Average annual temperatures range from 19.4 °C (low) to 28.3 °C (high). Annual precipitation averages 1472.2 Millimeters. Iona is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.8 °C | 23 °C | 58.67 mm |
| February | 14.1 °C | 24.3 °C | 49.28 mm |
| March | 15.9 °C | 25.8 °C | 54.86 mm |
| April | 18.8 °C | 28.1 °C | 66.04 mm |
| May | 21.5 °C | 30.3 °C | 91.95 mm |
| June | 23.7 °C | 31.6 °C | 258.57 mm |
| July | 24.4 °C | 32.1 °C | 238.25 mm |
| August | 24.4 °C | 32.3 °C | 247.9 mm |
| September | 23.9 °C | 31.8 °C | 225.3 mm |
| October | 21.6 °C | 29.6 °C | 83.31 mm |
| November | 17.2 °C | 26.5 °C | 47.5 mm |
| December | 14.6 °C | 24.3 °C | 50.55 mm |
| Annual | 19.4 °C | 28.3 °C | 1472.18 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Aw - Tropical Savanna (Wet and Dry Climate) |