December in Scottsbluff is the coldest month of the year. In December, the weather in Scottsbluff is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Scottsbluff has 17 sunny, 10 partly cloudy, 2 snowy, 1 rainy, and 1 cloudy day in December. The snowfalls are usually light. December as well as January, February, and July is considered the most uncomfortable time to visit Scottsbluff.