It depends. In some regions, yes, they are very predictable. In others, their unpredictability is predictable. Assuming you are in the US, much depends on which side of the continent you are on, what latitude you are at, and whether you are near a mountain range or large body of water (and which side of these you are on). Any of these things will affect the stability of the climate, and how quickly it will change either in response to weather systems or the seasons.