Sweet Grass County, Montana | Weather

Summer high temperatures in Sweet Grass County average about 80°F—rarely reaching 100°F—and summer nights often cool to the 50 to 60°F range. Winter temperatures are typically more moderate than many areas of Montana due to the local “Chinook” winds, with the average low November through February being about 20°F.  The average winter high is 40°F.  

Average precipitation is 1.36 inches per month, with highest levels seen in the months of April through June.