Sylvania, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.7 °C (high). Annual precipitation averages 1473.4 Millimeters. Sylvania is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 9.1 °C | 150.37 mm |
| February | 0.4 °C | 11.6 °C | 144.27 mm |
| March | 3.7 °C | 16.2 °C | 140.97 mm |
| April | 7.8 °C | 21 °C | 131.83 mm |
| May | 12.8 °C | 25.1 °C | 114.55 mm |
| June | 17.7 °C | 29 °C | 118.11 mm |
| July | 18.9 °C | 30.4 °C | 109.98 mm |
| August | 18.4 °C | 30.3 °C | 87.88 mm |
| September | 15.2 °C | 27.5 °C | 111 mm |
| October | 8.8 °C | 22 °C | 84.07 mm |
| November | 3 °C | 15.4 °C | 125.98 mm |
| December | 0.4 °C | 10.8 °C | 154.43 mm |
| Annual | 8.8 °C | 20.7 °C | 1473.44 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |