So if I wanted to calculate degree days for various areas in the Puget Sound area, where would be a good source of historic weather data? Wunderground has weather stations all over the place, but I can't find any archives of historic data. Western Regional Climate Center has some locations and some dates, but not everything I'm looking for, and their data is averaged by month, not by day.

I know farmers use this kind of information, and some extension services post degree days for local farmers, but I can't seem to find anything for western Washington.

Any ideas?