I came across this website at the weekend called Weather Spark and thought this would be a good place to share it. Not sure how well known it is!
You can find it at www.weatherspark.com
I quote from their website, "WeatherSpark is a new type of weather website, with interactive weather graphs that allow you to pan and zoom through the entire history of any weather station on earth."
A really nice way of visualising historical weather data.
Enjoy!!