We've rigged up an FPV penguin that is capable of flying in heavy rain. Eventually, we'd love to send it up in a storm, but today we were able to to a test flight in a heavy downpour.
Our ground station is in a small tent by the end of the ramp, and we use a wireless 5.8GHz video relay to our monitor inside the building.
Special thanks to Alec for volunteering to run out in the rain and get the plane for us. Looking good, buddy...