Hot Enough for Violence?

Here's a half-baked (sorry) theory that violence is linked to hot weather.

If that were the case, I'd be living in one of the most violent places on earth. Phoenix regularly hits over 100 degrees in the summer and we don't think it's unusual unless the temperature gets over 120.

One of the other theories, of course, is that hot weather makes people more lethargic. That one may have more merit. It's time for my nap.