Jewett, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.2 °C (low) to 25.8 °C (high). Annual precipitation averages 1056.7 Millimeters. Jewett is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.1 °C | 15.3 °C | 86.87 mm |
| February | 5.2 °C | 17.6 °C | 86.61 mm |
| March | 8.7 °C | 21.6 °C | 93.73 mm |
| April | 12.6 °C | 25.6 °C | 88.9 mm |
| May | 17.4 °C | 29.4 °C | 106.17 mm |
| June | 21.3 °C | 33 °C | 88.14 mm |
| July | 22.8 °C | 35.1 °C | 44.96 mm |
| August | 22.3 °C | 35.6 °C | 66.55 mm |
| September | 19.2 °C | 32.2 °C | 89.41 mm |
| October | 13.5 °C | 27.1 °C | 111 mm |
| November | 8.2 °C | 20.7 °C | 91.95 mm |
| December | 3.8 °C | 16.1 °C | 102.36 mm |
| Annual | 13.2 °C | 25.8 °C | 1056.65 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |