Weather will likely play an important role when you plan your trip to Little Diomede Island, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 40°F, while the coldest months are February and January with an average of 5°F. The snowiest months in Little Diomede Island are March, December, January, and May, with each month seeing an average of 27 inches of snowfall.