According to the Köppen climate classification, Hesperia has a cold desert climate, BWk on climate maps.
Winter days are cool with high temperatures averaging around 60 °F (16 °C), but temperatures get cold overnight, as the average low temperatures for December and January are around freezing. It is also the area’s wet season. The rain shadow caused by the mountain ranges to the south and west shields Hesperia from the majority of winter rainfall, but heavy rain is not uncommon. Winter snowfall is sporadic – the average yearly snowfall amount is 4.4 inches.
Summer days are very hot, with high temperatures typically nearing 100 °F (38 °C). This excessive heat is typical of the Mojave Desert as a whole. The large diurnal temperature variation, though, provides substantial relief overnight. In the later part of the season, sporadic summer thunderstorms associated with the North American monsoon can bring power outages and local flash floods.