The cities characteristic fog is the result of cold ocean water trying to mesh with hot Central Valley (http://en.wikipedia.org/wiki/Central_Valley_(California)) air. It is not unusual for the eastern sheltered parts of the city to recieve more sunshine than other parts such as Sunset district, which tends get fogged out. On the same token, further inland into the San Francisco Bay it can get real hot, but atleast it is a dry heat out here.
The climate of San Francisco makes it extraordinarily well-suited for growing landscape trees (and growing nearly anything really!). No tree guide can help you identify all of the citys trees, native species seem to grow where they can and many others dominate the yards of suburban homes. There are hybrids and imports from Asia, Europe, South America and Australia. Favorable landscape species such as sycamore, ash, elm, oak (including evergreen ones) and maples can be found here too. So, anyone working with the trees has a lot to learn, and let me tell you, tree identification in San Francisco is a real challenge!
As I write this a new front has moved in and ruined a solid 10 days of blue bird days, which was honestly the longest period of sunshine I have experienced in the middle of winter in my life. The front will bring frightfully cold temperatures in the 50s and rain, but they need the later very badly here! Wishful thinking near my place:
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