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I spent a week working in northern California. I did some runs before work on most days I was there. They are so incredibly lucky over there. I was running without gloves, a buff or my headband even at 5am. The trails I found on my last day were dry and did not leave me muddy. It was very hard to believe this was December!
I did a brief write up here: http://ninjakhan.co.uk/2012/12/11/a-week-in-california/
Check out the panoramic shot at the bottom of the post - there is a picture but also a 3d interactive thingy.