Weather is probably a major factor when you plan your trip to Extrema, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and February with an average temp of 68°F, while the coldest months are July and June with an average of 61°F. The rainiest months in Extrema are January, December, February, and November, with each month seeing an average of 11 inches of rainfall.