January in Ruthin is the rainiest, the windiest, and the coldest month of the year. In January, the weather in Ruthin is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Ruthin has 26 rainy, 3 sunny, and 2 cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Ruthin.