Usually season 2. At that point the writing team has their footing but isn't out of ideas and trying to drag it out. Most shows start going downhill in season 3/4.
Winter because I live in Brazil, which is a tropical and very humid country so the heat can get unbearable even here in the south where it's colder compared to the north.
There are a few cities that get cold enough to reach negative Cº, but where I live it's mostly between 10º-20º during winter so I just need some extra coats and more blankets and I'm happy. During summer I can only take off so many layers before it becomes illegal.
Summer for the exact opposite reason. In winter it's -10 to -30ºC and the sun doesn't come up for two months. Absolute bullshit. I don't even do winter sports.
Outdoor activities are possible without damaging the gear due to the humidity, and if you like water even outdoor swim became possible
Having sunlight up to 22 or even 23 is pretty great, you can have a late dinner outdoor, or get some beers in the parks with your friends. It's also safer to come back home, especially if you ride a bicycle or are a woman.
Many people are in holidays, so things are quieter
I am talking about having sunlight up to 22-23 in the evening,
Unfortunately, I don't live anymore in a place with many days above 40. (Which to be fair are great as a kid when you spend the afternoon chilling near the river, but sucks when you're adult and stuck in an office)
Spring, because everything is coming to life after the dreary gray winter. I can work in my garden, it's not humid or too hot, and the mosquitos aren't out yet.
This is a weird question for me, I’m from the American southeast, I remember having fall when I was a young man and it was wonderful, but those years weren’t common, the seasons I knew were hot n humid and winter(which was often hotter and humider than it should’ve been). Now I’m in the PNW and I think summer is far and away my favorite, although fall is still superb
I have a love/hate relationship with summer. Climate change has made it so I don't even want to go outside... but they schedule all the fun things in the summer! Local concerts! Farmers market! Outdoor movies! Craft festivals! Carnivals! I love all those things, I just hate sweating!
So summer is probably my least favorite, but also my favorite.