Weather is probably a major factor when you plan your trip to Chewelah, but bear 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 temperature of 19°C, while the coldest months are December and January, with an average of -2°C. The snowiest months in Chewelah are January, December, February and March, with each month seeing an average of 16 cm of snowfall.