Planning for the weather is an important factor for making your trip to Little Diomede Island a success, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 4°C, while the coldest months are February and January, with an average of -15°C. The snowiest months in Little Diomede Island are March, December, January and May, with each month seeing an average of 69 cm of snowfall.