Back in the 80s maybe even the 70s, there used to be a louvered screen available. It was supposed to keep the water out and still let the air flow through.
It didn't work. It looked good when new, horrible when just a few years old. It dented worse than foil A/C heat sinks or radiators. Moss grew on it and water would seep through it. It faded in the sunlight. I didn't like it.
I did do a Google search and came up nothing. It may not be available anymore.
I have also seen 2 screens spaced 1 1/2 to 2" apart. The first screen was supposed to stop the rain and the second screen was supposed to stop the wind from blowing the accumulated moisture in. I never saw it working. I doubt that it was 100% rain tight.