Air rises at the equator, it rises because it is hot at the equator. At 30' N the air is dropping. Because of the dropping air, it is very dry there.
Haiku
Air drops from the sky,
Therefore it is very dry,
The pressure is high.
https://www.wunderground.com/forecast/us/fl/jacksonville
https://commons.wikimedia.org/wiki/File:2014-06-24_11_03_32_View_east_along_Elko_County_Route_746_(North_Fork%E2%80%90Charleston_Road)_at_the_junction_with_Elko_County_Route_747_(Deeth-Charleston_Road).jpg
https://commons.wikimedia.org/wiki/File:2015-09-27_12_30_53_View_north_along_Buckhorn_Draw_Road_(Emery_County_Route_332)_about_15.0_miles_north_of_Interstate_15_in_Emery_County,_Utah.jpg