Colleyville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56 °F (low) to 76.8 °F (high). Annual precipitation averages 38.5 Inches. Colleyville 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 | 35.5 °F | 56.6 °F | 2.48 in. |
| February | 39.0 °F | 60.6 °F | 2.75 in. |
| March | 46.8 °F | 68.1 °F | 3.46 in. |
| April | 54.6 °F | 76.0 °F | 3.35 in. |
| May | 64.1 °F | 83.4 °F | 4.57 in. |
| June | 72.2 °F | 91.4 °F | 3.87 in. |
| July | 75.5 °F | 95.7 °F | 2.22 in. |
| August | 75.4 °F | 96.1 °F | 2.48 in. |
| September | 68.1 °F | 89.0 °F | 3.28 in. |
| October | 56.7 °F | 78.8 °F | 4.3 in. |
| November | 46.0 °F | 67.0 °F | 2.84 in. |
| December | 37.5 °F | 58.3 °F | 2.93 in. |
| Annual | 56 °F | 76.8 °F | 38.53 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 | Cfa - Humid Subtropical Climate |