Ona, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.5 °C (low) to 28.6 °C (high). Annual precipitation averages 1395 Millimeters. Ona is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.3 °C | 22.7 °C | 65.28 mm |
| February | 10.7 °C | 24.3 °C | 55.12 mm |
| March | 12.4 °C | 26.3 °C | 72.14 mm |
| April | 15.2 °C | 28.7 °C | 70.36 mm |
| May | 18.3 °C | 31.2 °C | 99.82 mm |
| June | 21.4 °C | 32.4 °C | 234.7 mm |
| July | 22.4 °C | 32.9 °C | 212.09 mm |
| August | 22.7 °C | 33.1 °C | 212.34 mm |
| September | 22.2 °C | 32.1 °C | 193.8 mm |
| October | 18.7 °C | 29.6 °C | 76.71 mm |
| November | 13.9 °C | 26.3 °C | 46.48 mm |
| December | 11.3 °C | 24 °C | 56.13 mm |
| Annual | 16.5 °C | 28.6 °C | 1394.97 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 |