Easy To Use Weather Hedging Tool

Unlike most weather contracts, this site makes them easy to get estimates and really hedge against fluctuations. Forbes has an article on them here.

Their Tools section makes the estimates dead simple to do.
https://www.weatherbill.com/tools

Friedberg, 26, has an astrophysics degree from UC, Berkeley and left his job in business development at Google last summer to start Weatherbill. Now up to a staff of 12, he plans to open a U.K. branch and eventually sell contracts tailored for specific neighborhoods or remote locations using a $250 weather gauge.

Biggest flaw is that right now you can't hedge a Hawaii vacation, "no reliable weather stations there" is what they told me.