A 50% chance of rain means "in all of recorded history, when conditions were similar, it rained 50% of the time," which leaves a lot to be interpreted by meteorology advancements. It does not mean that the "rain trigger" has a 50% chance of being pulled, since as we know, past results do not affect future outcomes in a pure probability, and the past conditions can only be correlated to rain, not directly tied to causation.
Also, I think there's a sweet spot somewhere in between a couple of hours and hundreds of years. Maybe around a month would be good to start.
you could even offer a money back guarantee... and if the probabilities and prices line up you dont even have to be that good at forecasting
http://www.techcrunch.com/2007/01/02/use-weatherbill-to-bet-...
Not sure how it's going for them, though they haven't been deadpooled.
Local. I don't care about the temperatures all across the Midwest. I care about the weather where I am right now (Boston).
> short-term or long-term?
short-term, but longer than a couple of hours -- upcoming weekend would be nice.
If you don't have that, why bother?