I live in Korea. Basically the weather is pretty bad year round, especially in the north (the north of South Korea, obviously, not North Korea!)
Cold, dry winters, gets down to minus 10 or 15 quite regularly. It wrecks your skin, mine is constantly flaky, no matter how much stuff I put on. Recently it has been a little milder though.
Summer is so hot and humid, but not in any pleasant sort of way. There are so many tall buildings that the heat gets trapped and it feels horrible. The only way to get round it is going to the mountains or air conditioned cafes.
Spring and autumn would be nice but they only last around two weeks. In spring, the yellow dust comes: yellow dust is dust that blows in from the Gobi desert, mixed with pollution. It is really bad for you, so you need an air purifier in your house and most people wear a mask when they go out. It has been terrible this year, it started around March and is still going now.
Autumn is probably the nicest, it's around 20 most days, but as I said, only lasts a few weeks.
The advantages are that in spring we get lovely cherry blossoms and in autumn, the leaves all turn red - there are a lot of maple trees here so the mountains are really beautiful. People come here specifically to see the autumn leaves.
Overall it does have a big impact on my mood, because I feel like I can never leave the house.
Makes me long for damp mild England!