Do you like weather sites?http://weatherspark.com/
Weatherspark was posted on G+ a week ago and it is the coolest weather site out there. It's complicated because it does so much but a few minutes checking out the graphs, pulling in past history or future forecasts and this thing is the bomb. I can go back and relive the Halloween storm of last year complete with clouds moving in, rain totals by the hour, wind speed, which direction, everything.
Older than 2007 and the data gets thinner but they might just be getting started pulling in the info.