Harwood, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.2 °F (low) to 79.8 °F (high). Annual precipitation averages 35.1 Inches. 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 | 39.5 °F | 62.3 °F | 2.42 in. |
| February | 43.5 °F | 66.0 °F | 1.94 in. |
| March | 50.0 °F | 72.7 °F | 2.8 in. |
| April | 56.5 °F | 79.4 °F | 2.71 in. |
| May | 65.0 °F | 86.0 °F | 4.36 in. |
| June | 71.1 °F | 91.8 °F | 3.39 in. |
| July | 72.8 °F | 95.1 °F | 1.96 in. |
| August | 72.7 °F | 96.3 °F | 2.7 in. |
| September | 67.4 °F | 90.4 °F | 3.24 in. |
| October | 58.1 °F | 82.4 °F | 4.09 in. |
| November | 48.2 °F | 71.5 °F | 2.86 in. |
| December | 41.1 °F | 63.9 °F | 2.66 in. |
| Annual | 57.2 °F | 79.8 °F | 35.13 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |