Polk City, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.1 °C (low) to 28.5 °C (high). Annual precipitation averages 1349.3 Millimeters. Polk City is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.6 °C | 22.1 °C | 71.88 mm |
| February | 11.3 °C | 23.8 °C | 58.17 mm |
| March | 13.2 °C | 26.1 °C | 75.69 mm |
| April | 16.2 °C | 28.8 °C | 70.61 mm |
| May | 19.4 °C | 31.4 °C | 92.71 mm |
| June | 22.2 °C | 32.8 °C | 211.33 mm |
| July | 23.2 °C | 33.2 °C | 196.09 mm |
| August | 23.2 °C | 33.2 °C | 204.98 mm |
| September | 22.4 °C | 32.2 °C | 179.83 mm |
| October | 19.1 °C | 29.7 °C | 75.18 mm |
| November | 14.4 °C | 25.9 °C | 46.74 mm |
| December | 11.4 °C | 23.3 °C | 66.04 mm |
| Annual | 17.1 °C | 28.5 °C | 1349.25 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |