The Green Triangle is fairly far up north, and it's in a region considered coastal. Remember, the sequoias of this area get almost *all* their water from the moisture in the air.
SoCal is a Mediterranean climate, so during the months of May-July (sometimes as late as August) if you're within about 25mi of the coast you're going to get what's called June Gloom, which is what is called a marine layer, a layer of low clouds that form just off the coast and move inland, usually no more than 25mi or so. Sometimes Santa Ana conditions will form during that time of year, but usually it's later, from July-October. Kinda surprising that it's happening right now. But then, we're having a heat wave up here that's pretty much unheard of for this time of year.
California has a rather wide range of climates, btw, which is due to a great degree to the topography. The Sierra Nevada range catches rain, and that forms a rain shadow on the eastern scarp. San Diego region tends to get tropical weather systems, and
sometimes those will move up as far north as the L.A. basin, but usually not. In the meantime, up in central/northern Cali here, we can get super-dry conditions, or we can get what is called the Pineapple Express, a weather system moving eastward from about the Hawai'ian islands. Then there are the deserts, which are obviously extremely dry. So, it really depends on where you are for the most part.
so you guys are dealing with low humidity most of the time. .... so they must have better humidity conditions in the green triangle / cali ?
I don't know if you'd call it 'better' per se, they have more problems with mold than someone like myself in the Sierra has to deal with, that's for sure.