Horizon City, Texas has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 50.1 °F (low) to 78.8 °F (high). Annual precipitation averages 9.1 Inches. Horizon City is located in USDA Plant Hardiness Zone 8b. 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 | 30.6 °F | 58.7 °F | 0.47 in. |
| February | 35.0 °F | 64.0 °F | 0.49 in. |
| March | 41.7 °F | 71.7 °F | 0.27 in. |
| April | 48.6 °F | 80.0 °F | 0.19 in. |
| May | 57.5 °F | 88.6 °F | 0.36 in. |
| June | 66.7 °F | 97.2 °F | 0.79 in. |
| July | 69.8 °F | 96.4 °F | 1.69 in. |
| August | 68.6 °F | 94.3 °F | 1.58 in. |
| September | 62.4 °F | 88.9 °F | 1.38 in. |
| October | 50.9 °F | 80.0 °F | 0.78 in. |
| November | 38.7 °F | 67.7 °F | 0.41 in. |
| December | 31.1 °F | 58.0 °F | 0.73 in. |
| Annual | 50.1 °F | 78.8 °F | 9.14 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |