Wind, rain and cold temperatures does me in. I hate rain, even when I'm not riding so it's 100 times worse when I'm on a bike. I dislike being wet and having my clothes stick to me which is why I hate going in water. I also detest wind because my ears hurt. However, cold weather is the worst, especially because my nose won't stop running and I hate riding with when my nose is constantly running. I don't mind heat but humidity makes it hard to do anything!