Rio, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 66.9 °F (low) to 82.5 °F (high). Annual precipitation averages 58.2 Inches. Rio is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 55.4 °F | 73.3 °F | 2.85 in. |
| February | 57.4 °F | 75.7 °F | 2.64 in. |
| March | 60.8 °F | 77.7 °F | 3.22 in. |
| April | 65.6 °F | 81.5 °F | 3.2 in. |
| May | 70.1 °F | 85.2 °F | 5.23 in. |
| June | 73.9 °F | 88.2 °F | 6.93 in. |
| July | 75.3 °F | 89.9 °F | 6.39 in. |
| August | 75.5 °F | 90.0 °F | 8.27 in. |
| September | 74.8 °F | 88.1 °F | 7.64 in. |
| October | 71.1 °F | 84.6 °F | 5.52 in. |
| November | 64.1 °F | 79.4 °F | 3.51 in. |
| December | 59.2 °F | 75.9 °F | 2.81 in. |
| Annual | 66.9 °F | 82.5 °F | 58.21 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |