Jasper, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10 °C (low) to 23.4 °C (high). Annual precipitation averages 1556 Millimeters. Jasper is located in USDA Plant Hardiness Zone 8a. 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 | -0.2 °C | 12.1 °C | 148.34 mm |
| February | 1.4 °C | 14.5 °C | 139.7 mm |
| March | 5.1 °C | 19.2 °C | 151.89 mm |
| April | 8.9 °C | 23.9 °C | 144.27 mm |
| May | 14.1 °C | 27.8 °C | 129.29 mm |
| June | 18.7 °C | 31.3 °C | 129.03 mm |
| July | 20.7 °C | 32.8 °C | 134.62 mm |
| August | 20.1 °C | 32.9 °C | 102.87 mm |
| September | 16.7 °C | 30.3 °C | 112.78 mm |
| October | 9.7 °C | 24.6 °C | 96.01 mm |
| November | 3.7 °C | 18.2 °C | 119.13 mm |
| December | 1.2 °C | 13.4 °C | 148.08 mm |
| Annual | 10 °C | 23.4 °C | 1556.01 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |