Highland Park, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.4 °C (low) to 24.7 °C (high). Annual precipitation averages 1025.2 Millimeters. Highland Park is located in USDA Plant Hardiness Zone 8b. 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 | 2.1 °C | 13.4 °C | 68.33 mm |
| February | 4.1 °C | 15.7 °C | 76.45 mm |
| March | 8.3 °C | 19.7 °C | 91.69 mm |
| April | 12.6 °C | 24.2 °C | 88.39 mm |
| May | 17.9 °C | 28.3 °C | 121.41 mm |
| June | 22.3 °C | 32.8 °C | 100.84 mm |
| July | 24.1 °C | 35.2 °C | 51.31 mm |
| August | 24.1 °C | 35.4 °C | 58.93 mm |
| September | 20.1 °C | 31.6 °C | 82.04 mm |
| October | 13.7 °C | 25.9 °C | 121.67 mm |
| November | 7.8 °C | 19.3 °C | 77.98 mm |
| December | 3.2 °C | 14.4 °C | 86.11 mm |
| Annual | 13.4 °C | 24.7 °C | 1025.15 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 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |