Reply by CaptainKlutz

Wood moisture levels and acclimation time vary due regional differences.
Rather than type a long answer explaining everything, here are some references:

Simple explanation of moisture in wood:
https://www.wood-database.com/wood-articles/wood-and-moisture/

US government Dept of Agriculture – Chapter 12 of Wood handbook on Moisture Content:
https://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/ch12.pdf

Dept of Agriculture reference on equilibrium moisture for wood used outdoors:
https://www.fpl.fs.fed.us/documnts/fplrn/fplrn268.pdf

Cheers!

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967