Jonestown, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.9 °C (low) to 26 °C (high). Annual precipitation averages 891.3 Millimeters. Jonestown is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °C | 16.2 °C | 58.42 mm |
| February | 4.7 °C | 18 °C | 52.07 mm |
| March | 8.5 °C | 21.9 °C | 76.45 mm |
| April | 12.4 °C | 25.9 °C | 66.8 mm |
| May | 17.4 °C | 29.5 °C | 112.01 mm |
| June | 21.1 °C | 33.1 °C | 84.07 mm |
| July | 22.3 °C | 34.9 °C | 61.98 mm |
| August | 22.1 °C | 35.6 °C | 67.06 mm |
| September | 19.3 °C | 32.2 °C | 83.06 mm |
| October | 13.6 °C | 27.3 °C | 95 mm |
| November | 7.8 °C | 21.1 °C | 71.63 mm |
| December | 3.4 °C | 16.7 °C | 62.74 mm |
| Annual | 12.9 °C | 26 °C | 891.29 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |