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I don't think it's a bad idea for inexperienced riders to choose their riding days a little bit more carefully, as even I hate riding in the rain. Why?
1) Visibility: my shield fogs easier and in general collects a lot of moisture, making it difficult to see at times
2) Traction: painted lines, oil slicks, hydroplaning are all a lot more of a problem on the bike
3) Other people: people can't drive for shit when it is perfect out, I trust them a lot less once the weather turns bad.
I don't give a shit about getting wet, it's all that other stuff that sucks