Have you tried www.weatherplanner.com? It predicts a full year ahead as a long term daily forecast. It's accuracy is in the 90% -- it tracks its own accuracy (for example if it predicts a clear day, and it rains for 2 minutes that counts as a 100% failure for the day). It does not do short term forecasting -- has to be 2 weeks away or more. I've used it for my long term planning and its great stuff, always on the ball and more so than the local 5 day forecast. I had one event I planned that the local meteorologists predicted as "showers" and weatherplanner predicted as "sunny 60 to 70 degrees, some clouds" and the local 5 day forecast was wrong, weatherplanner was right. I'm sold. Try it.

Calvin