If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Lake Louise: The hottest months are usually July and August, with an average temperature of 9°C, while the coldest months are December and February, with an average of -12°C. The snowiest months in Lake Louise are April, January, February and November, with each month seeing an average of 332 cm of snowfall.