Arjay, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.9 °C (low) to 19.7 °C (high). Annual precipitation averages 1382.3 Millimeters. Arjay is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 7.3 °C | 114.05 mm |
| February | -2.4 °C | 9.6 °C | 119.38 mm |
| March | 1 °C | 14.7 °C | 131.57 mm |
| April | 5.8 °C | 20.5 °C | 127 mm |
| May | 11.4 °C | 24.7 °C | 118.62 mm |
| June | 15.8 °C | 28.3 °C | 135.89 mm |
| July | 18.1 °C | 29.8 °C | 134.11 mm |
| August | 17.4 °C | 29.4 °C | 111.76 mm |
| September | 13.7 °C | 26.8 °C | 86.36 mm |
| October | 6.7 °C | 20.9 °C | 76.71 mm |
| November | 0.9 °C | 14.7 °C | 94.23 mm |
| December | -1.7 °C | 9.3 °C | 132.59 mm |
| Annual | 6.9 °C | 19.7 °C | 1382.27 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |