If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Fox Glacier: The hottest months are usually February and January, with an average temperature of 7°C, while the coldest months are July and August, with an average of -3°C. The rainiest months in Fox Glacier are May, September, December and July, with each month seeing an average of 360 mm of rainfall.