Jonestown, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.3 °C (low) to 22.5 °C (high). Annual precipitation averages 1427.2 Millimeters. Jonestown is located in USDA Plant Hardiness Zone 8a. 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 | 0.3 °C | 10.1 °C | 124.71 mm |
| February | 1.9 °C | 12.4 °C | 134.37 mm |
| March | 6.1 °C | 17.5 °C | 134.87 mm |
| April | 11 °C | 22.8 °C | 152.15 mm |
| May | 16.6 °C | 27.5 °C | 136.91 mm |
| June | 20.7 °C | 31.6 °C | 115.57 mm |
| July | 22.1 °C | 32.7 °C | 106.93 mm |
| August | 21.2 °C | 32.8 °C | 80.77 mm |
| September | 17.3 °C | 30.1 °C | 80.26 mm |
| October | 10.8 °C | 24.4 °C | 98.55 mm |
| November | 5.1 °C | 16.9 °C | 113.28 mm |
| December | 1.9 °C | 11.6 °C | 148.84 mm |
| Annual | 11.3 °C | 22.5 °C | 1427.21 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |