January in Daejeon is the snowiest and the coldest month of the year. In January, the weather in Daejeon is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Daejeon has 13 partly cloudy, 10 sunny, 5 cloudy, 2 rainy, and 1 snowy day in January. The rains are usually light. January as well as February, July, August, and December is considered the most uncomfortable time to visit Daejeon.