Modding the Weather

Hi all!

I want to modify the rain frequency on The Center.
Can someone tell me where should i modify to just make the chance of rain lower or higher? without modifying anything else? I was looking inside the truesky sequences, but it got me confused.
Thanks in advance for any info!

Not sure about the center but on the island and SE, all the weather control is in the level bp.
I would imagine that’s where it on the center too