Coldiron, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.9 °C (low) to 19.5 °C (high). Annual precipitation averages 1325.4 Millimeters. Coldiron is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.8 °C | 7.3 °C | 109.73 mm |
| February | -2.5 °C | 9.6 °C | 114.81 mm |
| March | 0.8 °C | 14.7 °C | 125.48 mm |
| April | 5.7 °C | 20.4 °C | 125.48 mm |
| May | 11.3 °C | 24.4 °C | 117.6 mm |
| June | 15.9 °C | 27.9 °C | 116.08 mm |
| July | 18.2 °C | 29.3 °C | 128.78 mm |
| August | 17.5 °C | 29.1 °C | 103.63 mm |
| September | 13.8 °C | 26.5 °C | 89.66 mm |
| October | 6.7 °C | 20.7 °C | 75.95 mm |
| November | 0.9 °C | 14.7 °C | 90.93 mm |
| December | -1.7 °C | 9.4 °C | 127.25 mm |
| Annual | 6.9 °C | 19.5 °C | 1325.38 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |