Visiting local bars in Duncan Lake is more fun in good weather. These temperatures and rainfall averages can help you choose the best time for bar hopping. The hottest months are usually July and August with an average temp of 56°F, while the coldest months are February and January with an average of -5°F. The snowiest months in Duncan Lake are November, December, February, and January, with each month seeing an average of 11 inches of snowfall.