http://www.nytimes.com/2008/05/16/business/worldbusiness/16solar.html

This, in a country that gets an average of only 1,528 hours of sunshine a year, less than a third of the total daylight hours. That figure is comparable to London’s but it is one-third fewer sunshine hours than in Florence, Italy, and only half San Diego’s, making German solar installations less efficient, and their growth all the more remarkable.