If you look at the book &quot;Sustainable Energy without the hot air&quot; you will find it chock full of data. Problem is, it&#x27;s for the UK, not the US. But FWIW, I think the UK is more north than the continental US.<p><a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;Sustainable-Energy-Without-Hot-Air&#x2F;dp&#x2F;0954452933" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;Sustainable-Energy-Without-Hot-Air&#x2F;dp&#x2F;...</a>