It's similar to the tv commercial for GE where an Italian boy brings home a "jar of wind", opens it inside the house and everything blows away. Cute and sappy!
I wish it was something anyone could trade. In the past, some of my most profitable futures trades were actually bets on weather.
I've tried signing up there before. If you try to register as an individual with a net worth less than $5 million, it tells you that you are not qualified to trade.