Blaine, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 5.5 °C (low) to 19.7 °C (high). Annual precipitation averages 1188 Millimeters. Blaine is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °C | 6.7 °C | 91.69 mm |
| February | -4.3 °C | 8.9 °C | 81.53 mm |
| March | -0.9 °C | 14.3 °C | 111.25 mm |
| April | 4.3 °C | 20.9 °C | 102.87 mm |
| May | 10.1 °C | 24.9 °C | 125.73 mm |
| June | 14.9 °C | 28.6 °C | 113.54 mm |
| July | 17.3 °C | 30.5 °C | 140.46 mm |
| August | 16.6 °C | 30.1 °C | 85.09 mm |
| September | 12.3 °C | 27 °C | 86.11 mm |
| October | 5.1 °C | 21 °C | 72.39 mm |
| November | -0.7 °C | 14.3 °C | 78.74 mm |
| December | -3.4 °C | 8.7 °C | 98.55 mm |
| Annual | 5.5 °C | 19.7 °C | 1187.95 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |