Snow: I hate snow. It's cold, wet, dirty, and it gets everywhere. You can never have the high ground when it comes to snow.
Heat>Cold: In the cold, all the pools are closed. In the heat, they're all open. No contest.
Bugs: You know those immortal ice zombies? They don't come in summer. Yeah, I'd rather not deal with that.
[spoiler]Summer is best season.[/spoiler]
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Bugs are more active in the summer, OP.