December in Cork is the windiest month of the year. In December, the weather in Cork is typically cold. Average daily high temperature in December is about 9 degrees above zero. On average, Cork has 13 rainy, 9 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 Cork.