January in Yellowknife is the cloudiest and the most freezing month of the year. In January, the weather in Yellowknife is typically freezing. Average daily high temperature in January is about 17 degrees below zero. On average, Yellowknife has 28 cloudy and 3 snowy days in January. The snowfalls are usually light. January as well as February, March, November, and December is considered the most uncomfortable time to visit Yellowknife.