The least favorite season of the year.

All that’s left is an allergy to air conditioners, but they work both in summer and winter, so they don’t affect the feeling of the season.

I also noticed that air-conditioned air makes me sneeze constantly and generally doesn’t feel very good (if it blows strongly enough). But I can’t list this as a downside of summer, because this downside is an alternative to the heat: either one or the other, heh.
Revan, I agree with the first two downsides of winter. I also have skin problems, and yes, my feet get cold. As for the warmth, I’m lucky enough to have it warm enough that I can even open the window a little to avoid stuffiness. Consider yourself lucky.

To go outside, you have to expend a lot of pointless effort - put on a bunch of clothes and walk around in all of them.

Well, it’s not that stressful.

It’s freezing outside. It becomes unpleasant to breathe (oh, fresh air, lol), and while I’m walking fast, I get hot because of all the clothes on me (I walk fast, and that’s why I don’t freeze), but as soon as I dress lighter or slow down, it immediately gets cold.

It’s not a problem at all. In winter, I always manage to find a balance so that I don’t sweat in my clothes from walking fast and don’t freeze. In summer, for example, it’s much more difficult.
The problem is different. In an “ideal” winter, when the temperature is always minus 10 or so, there are no problems with clothes or anything else. In a real winter, half of the time is spent at around zero temperature. Fluctuations in high/low humidity, the presence/absence of wind, the presence/absence, brrr, of slush – all of this makes real winter noticeably worse and also increases the problems with adapting to the weather. Perhaps, for me, this is the most noticeable downside of winter; the rest are more or less correctable to some extent.

Everyone around is sick, coughing, etc., and I’m a germophobe, so it bothers me...

Actually, people get sick less in winter than in autumn, for example. Although this winter is an exception; for some reason, a lot of people have gotten sick this winter.

Ice is, of course, better than slush and rivers of mud, but nevertheless, constantly having to watch out so as not to “step carefully” is not very fun.

Again, if it’s strongly below zero for many days in a row, the ice becomes non-slippery and doesn’t cause problems. Fluctuations of +1/-1 => we go back to what I said before.

2. Insects.

Yes, they are so annoying when you go out into nature.
We went far outside the city (to the Yaroslavl region), and I, being naive, decided to go for a run, and as a result, I ran away from a Huge Swarm of Horseflies, and I sprinted, although I was going to jog. They also sense the smell and heat and fly in even more from all around.
You need to live in Lapland, and then you can love summer. Heat – well, occasionally, and conversely, the sun warms you up, and that’s nice... Insects? Forget about them. Yard trash? What yard trash? What yard? The nearest neighbors live five kilometers away; there’s no one nearby except for reindeer... That’s awesome.

Downsides
Birthday.

How unusual...