December in Gumi is the windiest month of the year. In December, the weather in Gumi is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Gumi has 15 sunny, 15 partly cloudy, and 1 rainy day in December. The rains are usually light. December as well as January, February, July, and August is considered the most uncomfortable time to visit Gumi.