Iola, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.8 °C (low) to 26.1 °C (high). Annual precipitation averages 1167.4 Millimeters. Iola is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °C | 15.9 °C | 98.55 mm |
| February | 5.9 °C | 18.1 °C | 80.77 mm |
| March | 9.4 °C | 21.9 °C | 90.17 mm |
| April | 13.3 °C | 25.8 °C | 85.34 mm |
| May | 18.2 °C | 29.6 °C | 125.98 mm |
| June | 21.8 °C | 33.1 °C | 108.97 mm |
| July | 23.1 °C | 34.9 °C | 68.07 mm |
| August | 22.8 °C | 35.5 °C | 82.3 mm |
| September | 19.7 °C | 32.4 °C | 101.85 mm |
| October | 14.1 °C | 27.6 °C | 115.82 mm |
| November | 8.7 °C | 21.4 °C | 101.85 mm |
| December | 4.8 °C | 16.8 °C | 107.7 mm |
| Annual | 13.8 °C | 26.1 °C | 1167.37 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |