Hardin, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.7 °C (low) to 26 °C (high). Annual precipitation averages 1564.4 Millimeters. Hardin is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.2 °C | 16.8 °C | 124.46 mm |
| February | 7.2 °C | 18.9 °C | 99.06 mm |
| March | 10.8 °C | 22.3 °C | 103.12 mm |
| April | 14.5 °C | 25.7 °C | 112.78 mm |
| May | 18.9 °C | 29.3 °C | 142.24 mm |
| June | 22.3 °C | 32.5 °C | 143 mm |
| July | 23.4 °C | 33.7 °C | 120.9 mm |
| August | 23.2 °C | 34.2 °C | 151.64 mm |
| September | 20.4 °C | 31.7 °C | 149.35 mm |
| October | 15.1 °C | 27.6 °C | 163.07 mm |
| November | 9.7 °C | 21.8 °C | 122.68 mm |
| December | 6.2 °C | 17.7 °C | 132.08 mm |
| Annual | 14.7 °C | 26 °C | 1564.38 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |