December in Wicklow is the windiest month of the year. In December, the weather in Wicklow is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Wicklow has 17 rainy, 7 cloudy, 4 sunny, and 3 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 Wicklow.