Weather is probably a major factor when you plan your trip to Colby, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 76°F, while the coldest months are January and February with an average of 36°F. The snowiest months in Colby are January, December, March, and November, with each month seeing an average of 6 inches of snowfall.