[chrido]

An alternativ would be that the weather "oracle" has something on stake, e.g. if it lies or is hacked, it looses a deposit. But then it goes further, maybe you need a voting mechanism, or other weather "oracles" participating in the vote ... in the end you need to get it game theorically right to incentivise honest "oracles" and punish dishonest.

In general I see two really hard challenges with smart contracts. Getting them bug free (i think formal verification which is worked on will help a lot) and getting the incentives right to punish dishonest behavior. (So far I haven't seen a lot work being done here, I also don't know how you could automise that, maybe some kind of simulation with AI based actors)