Symsonia, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 20.3 °C (high). Annual precipitation averages 1320.8 Millimeters. Symsonia is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 7.1 °C | 99.31 mm |
| February | -1.1 °C | 9.6 °C | 104.39 mm |
| March | 3.3 °C | 15 °C | 121.67 mm |
| April | 8.4 °C | 20.9 °C | 131.06 mm |
| May | 14 °C | 25.6 °C | 140.46 mm |
| June | 18.7 °C | 29.8 °C | 117.86 mm |
| July | 20.6 °C | 31.6 °C | 108.2 mm |
| August | 19.3 °C | 31.2 °C | 81.79 mm |
| September | 15.2 °C | 28.1 °C | 91.95 mm |
| October | 8.7 °C | 21.8 °C | 94.74 mm |
| November | 3 °C | 14.5 °C | 106.17 mm |
| December | -0.9 °C | 8.8 °C | 123.19 mm |
| Annual | 8.9 °C | 20.3 °C | 1320.79 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |