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Winter feels so dark and cold, it makes the roads slippery and people get upset or die from crashing and there's more colds and it's all wet and people get SAD and get a Vitamin D deficiency.
The summer can be too hot and dehydrate people and burn your skin. And midwinter is especially bleak. Plus people are less social.
I think spring is the best weather wise, and most people and mammals seem to agree, too. It's also pretty and blossom makes a nice photo, makes the art culture boom and everyone's excited and there's lots of young animals and it can look like autumn but you know things are going to look more pretty. Also in meridian Europe it gives brilliant chiaroscuro and beautiful flower colours. And early spring can have nice fluffy snow.