Deer Park, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 61.9 °F (low) to 78.6 °F (high). Annual precipitation averages 58.4 Inches. Deer Park is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.9 °F | 62.9 °F | 4.47 in. |
| February | 48.5 °F | 66.3 °F | 3.36 in. |
| March | 55.2 °F | 71.7 °F | 3.71 in. |
| April | 61.6 °F | 77.7 °F | 4.25 in. |
| May | 69.1 °F | 84.2 °F | 5.5 in. |
| June | 75.0 °F | 89.8 °F | 6.11 in. |
| July | 76.6 °F | 91.8 °F | 4.6 in. |
| August | 76.4 °F | 92.5 °F | 6.14 in. |
| September | 72.3 °F | 88.4 °F | 5.81 in. |
| October | 63.2 °F | 81.1 °F | 5.22 in. |
| November | 53.3 °F | 71.5 °F | 4.7 in. |
| December | 46.8 °F | 64.7 °F | 4.48 in. |
| Annual | 61.9 °F | 78.6 °F | 58.35 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |