During hot weather allow umbrellas to help keep the Weather Rabbit happy.
This should especially benefit during dry and/or clear weather with predominantly white umbrellas helping more. Shade seems to help the lower humidity reaches. I wish WunderGround provided an "In the Shade" temperature along with the "Feels Like" information.
Perhaps consider adding a misting version to help get through those days with terrible high dry heats.
We've had some suggestion for the addition of items that could change comfort levels, like a fan or a heater. The idea of adding to the functionality of the umbrella by having it help cool the rabbit down is worth considering, and we have noticed some people sharing pictures of their Weather Rabbit using the umbrella during sunny days.