I don't think it's automatically trashy but it's more of a risk.
I've met a couple kids named Summer in the last few years, and also know an adult Summer. None of them, nor their parents, are trashy. It actually reads as like a "rich hippie" name to me. Similar to names like Indigo, Autumn, or Sunday. I could see Winter slotting in with those.
BUT the huge caveat here is that if your family is not a "rich hippie" family, it could come off all wrong. So you have to be self aware here, which is hard, because you have to think about how other people will see your family in the future when your kid is a person in the world. Tricky.
This is why a lot of people just default to more popular, standard names. They aren't as risky. But they can be a bit more boring and feel less specific to you or your kid. That's the trick of naming a baby.