There are places in the world that experience distinct seasons.
Ideally, the seasons last for several months each.
I expect it to be chilly and snowy during the winter, and mild and rainy in the Spring. It should be hot and humid in the summer, and cool and crisp during the fall. However, the seasons in my area do not work that way. Both Winter and summer time are severe and yet rather short. Because of this, the Winter and summer seasons can show up without much warning. Maybe if it would get gradually cooler as fall and Winter progressed, I would be better about remembering to have my furnace serviced by a certified HVAC serviceman before it become so cold. Instead, it can be mild one week in the late fall, and then, suddenly cold the next week! Before I know it, I need to start up my furnace, and yet I have not had the opportunity to have it diagnosed! It happens much the same in the summer. The afternoons stay nice and warm, yet breezy enough to open a few windows to keep cool. The next day it might be 90 degrees with 100% humidity! Because of this fluctuation, I have learned to ignore the strange weather that my region experiences. I choose a specific time each year to have my cooling unit and furnace maintained, no matter if the weather it super hot or cold. That way, I will be prepared no matter what the weather brings. Even during the cold snaps or the heat waves, my temperature control units are able to handle it!