Idk who told you that but I work better in my room or office when it's raining out, than 100degrees of sun it gets really uncomfortable to sit and program :( nevertheless I love this design good web designer for sure!
Just as you don't go outside in WA to write code when it's raining, you don't go out to write code in AZ when it's 100+. The A/C inside buildings works just fine. :) Anyway, each person with his/her own likes.