Keller, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.4 °F (low) to 76.9 °F (high). Annual precipitation averages 37.9 Inches. Keller 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 | 35.0 °F | 57.0 °F | 2.41 in. |
| February | 38.4 °F | 60.5 °F | 2.68 in. |
| March | 46.3 °F | 68.5 °F | 3.38 in. |
| April | 54.0 °F | 76.1 °F | 3.3 in. |
| May | 63.6 °F | 83.4 °F | 4.42 in. |
| June | 71.7 °F | 91.7 °F | 3.89 in. |
| July | 75.1 °F | 95.9 °F | 2.26 in. |
| August | 74.9 °F | 96.4 °F | 2.48 in. |
| September | 67.3 °F | 89.2 °F | 3.13 in. |
| October | 56.1 °F | 78.7 °F | 4.21 in. |
| November | 45.6 °F | 67.2 °F | 2.83 in. |
| December | 36.9 °F | 58.3 °F | 2.94 in. |
| Annual | 55.4 °F | 76.9 °F | 37.93 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 |