I live in Oregon and it can get pretty dry around here but she's in a grow tent and it feels like it can get kinda muggy occasionally. I temperature regulate and have plenty of air in and out... Two 600w LED's, 7 gal fabric pot. She's Pineapple Express, so if anyone has grown this strain and has good info about Pineapple express. ;)
Typicaly you want the RH @ 50 to 60% in veg and 40 to 50 in flower. Too much moiture will promote many problems and being too dry will slow growth,
Juust my opinion, hope it helps.
Happy farming