forecast 1 year ahead?? - they say they can predict with up to 83% accuracy the weather on a specific day up to a year in advance .

Any statisticians/meteorologists/Cecilians who can step in and apply some scientific skepticism, cut through the jargon, and serve up the straight dope?

p.s. - This is of vital national importance, Iā€™m trying to plan my wedding! :slight_smile: