Rained out vacation? Don't worry - you're insured!

I've heard of travel insurance, but never this kind.

French travel agencies have started offering insurance to cover bad weather.

Vacationers can claim back part of the cost of their trip -- up to 400 euros, or $556 -- if they suffer at least four days of rain in any one week, according to a Reuters story.

But how will the travel agent know if you're telling the truth and not just pouring water on your suitcase?

Aon France will use satellite photos obtained by the French weather bureau to calculate how much insurance holders will receive.