January in Denver is the coldest month of the year. In January, the weather in Denver is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Denver has 15 sunny, 8 partly cloudy, 5 snowy, and 3 cloudy days in January. The snowfalls are usually light. January as well as February, April, May, and June is considered the most uncomfortable time to visit Denver.