You'll likely spend much of your trip indoors, but if you want to see more of the area, looking at local weather trends is a good idea. The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are December and January, with an average of 0°C. The snowiest months in Susanville are March, February, January and April, with each month seeing an average of 17 cm of snowfall.