Sylvania, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.5 °F (low) to 59.4 °F (high). Annual precipitation averages 35.6 Inches. Sylvania is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.0 °F | 32.5 °F | 2.4 in. |
| February | 19.2 °F | 35.5 °F | 2.14 in. |
| March | 27.2 °F | 45.2 °F | 2.51 in. |
| April | 38.1 °F | 58.4 °F | 3.47 in. |
| May | 49.6 °F | 70.0 °F | 3.8 in. |
| June | 59.4 °F | 79.8 °F | 3.55 in. |
| July | 62.6 °F | 83.8 °F | 3.35 in. |
| August | 60.6 °F | 81.7 °F | 3.39 in. |
| September | 53.3 °F | 75.8 °F | 2.95 in. |
| October | 42.0 °F | 63.1 °F | 2.86 in. |
| November | 32.3 °F | 49.1 °F | 2.82 in. |
| December | 24.0 °F | 37.5 °F | 2.35 in. |
| Annual | 40.5 °F | 59.4 °F | 35.59 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |