Sylvan Springs, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 23.1 °C (high). Annual precipitation averages 1481.6 Millimeters. Sylvan Springs 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 | 1.3 °C | 12.2 °C | 136.4 mm |
| February | 2.7 °C | 14.7 °C | 140.21 mm |
| March | 6.6 °C | 19.1 °C | 144.53 mm |
| April | 10.6 °C | 23.6 °C | 131.83 mm |
| May | 15.6 °C | 27.4 °C | 113.28 mm |
| June | 19.8 °C | 30.7 °C | 124.21 mm |
| July | 21.6 °C | 32.4 °C | 127.25 mm |
| August | 21.2 °C | 32.2 °C | 107.95 mm |
| September | 18.2 °C | 29.7 °C | 114.05 mm |
| October | 11.7 °C | 24.1 °C | 86.36 mm |
| November | 5.8 °C | 18.1 °C | 120.14 mm |
| December | 2.6 °C | 13.5 °C | 135.38 mm |
| Annual | 11.5 °C | 23.1 °C | 1481.59 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 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |