Weather is probably a major factor when you plan your trip to Mount Hart, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually November and October with an average temp of 88°F, while the coldest months are July and August with an average of 78°F. The rainiest months in Mount Hart are January, February, December, and March, with each month seeing an average of 8 inches of rainfall.