Taking the local weather in Barnes Lake-Millers Lake into account can help you maximise your time at the pool during your trip. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Barnes Lake-Millers Lake are January, February, March and December, with each month seeing an average of 17 cm of snowfall.