Zephyr, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.3 °F (low) to 77.2 °F (high). Annual precipitation averages 30.3 Inches. Zephyr is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.6 °F | 58.8 °F | 1.66 in. |
| February | 36.8 °F | 62.7 °F | 2.08 in. |
| March | 44.5 °F | 69.5 °F | 2.57 in. |
| April | 51.0 °F | 77.2 °F | 2.33 in. |
| May | 60.3 °F | 83.7 °F | 4.16 in. |
| June | 68.1 °F | 90.6 °F | 3.86 in. |
| July | 70.8 °F | 94.5 °F | 1.95 in. |
| August | 70.6 °F | 94.7 °F | 2.16 in. |
| September | 63.9 °F | 88.1 °F | 2.81 in. |
| October | 52.5 °F | 78.9 °F | 3.12 in. |
| November | 42.1 °F | 67.7 °F | 2.03 in. |
| December | 33.9 °F | 59.6 °F | 1.58 in. |
| Annual | 52.3 °F | 77.2 °F | 30.31 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 |