Weather is probably a major factor when you plan your trip to La Rosiere, 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 13°C, while the coldest months are January and February, with an average of -4°C. The rainiest months in La Rosiere are May, December, November and January, with each month seeing an average of 189 mm of rainfall.