Cerulean, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.4 °C (high). Annual precipitation averages 1289.6 Millimeters. Cerulean 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 | -2.8 °C | 7.2 °C | 95.25 mm |
| February | -1.2 °C | 9.8 °C | 103.38 mm |
| March | 3.1 °C | 15 °C | 121.41 mm |
| April | 8.3 °C | 21 °C | 125.22 mm |
| May | 13.8 °C | 25.5 °C | 133.6 mm |
| June | 18.6 °C | 29.8 °C | 117.35 mm |
| July | 20.6 °C | 31.5 °C | 104.65 mm |
| August | 19.3 °C | 31.3 °C | 80.77 mm |
| September | 15.2 °C | 28.3 °C | 88.65 mm |
| October | 8.9 °C | 21.9 °C | 97.79 mm |
| November | 2.9 °C | 14.9 °C | 101.85 mm |
| December | -0.9 °C | 9 °C | 119.63 mm |
| Annual | 8.8 °C | 20.4 °C | 1289.55 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 |