December in Kilkenny is the windiest month of the year. In December, the weather in Kilkenny is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Kilkenny has 15 rainy, 7 cloudy, 5 sunny, and 4 partly cloudy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Kilkenny.