Harwood, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14 °C (low) to 26.6 °C (high). Annual precipitation averages 892.3 Millimeters. Harwood is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.2 °C | 16.8 °C | 61.47 mm |
| February | 6.4 °C | 18.9 °C | 49.28 mm |
| March | 10 °C | 22.6 °C | 71.12 mm |
| April | 13.6 °C | 26.3 °C | 68.83 mm |
| May | 18.3 °C | 30 °C | 110.74 mm |
| June | 21.7 °C | 33.2 °C | 86.11 mm |
| July | 22.7 °C | 35.1 °C | 49.78 mm |
| August | 22.6 °C | 35.7 °C | 68.58 mm |
| September | 19.7 °C | 32.4 °C | 82.3 mm |
| October | 14.5 °C | 28 °C | 103.89 mm |
| November | 9 °C | 21.9 °C | 72.64 mm |
| December | 5.1 °C | 17.7 °C | 67.56 mm |
| Annual | 14 °C | 26.6 °C | 892.3 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |