Cynthiana, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 19.3 °C (high). Annual precipitation averages 1222.3 Millimeters. Cynthiana 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 | -4.4 °C | 4.8 °C | 91.19 mm |
| February | -2.9 °C | 7.6 °C | 78.23 mm |
| March | 1.7 °C | 13.1 °C | 112.78 mm |
| April | 7.5 °C | 19.7 °C | 129.29 mm |
| May | 13.3 °C | 25.1 °C | 134.11 mm |
| June | 18.1 °C | 29.7 °C | 112.52 mm |
| July | 19.9 °C | 31.3 °C | 112.01 mm |
| August | 18.8 °C | 30.8 °C | 78.49 mm |
| September | 14.5 °C | 27.8 °C | 87.88 mm |
| October | 8.1 °C | 21.3 °C | 87.63 mm |
| November | 2.2 °C | 13.3 °C | 99.82 mm |
| December | -2.3 °C | 7.1 °C | 98.3 mm |
| Annual | 7.9 °C | 19.3 °C | 1222.25 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |