Weather will likely play an important role when you plan your trip to Dickinson, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are February and January, with an average of -6°C. The snowiest months in Dickinson are October, February, April and December, with each month seeing an average of 13 cm of snowfall.