I think it's psychological. When you live in a cold / dark climate you have more down time to notice all your aches and pains and every ache / pain can be used as an excuse to not do something in the cold. When you live in a sunny warm climate there is so much you can do outside like golf, swimming and on and on that you refuse to let the aches / pains from stopping you from enjoying the great weather. Plus you are most likely more active in a sunny warm climate so your muscles are a little stronger and it relieves some of the stress put on joints.
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