In central North Carolina it tends to be pretty humid and deeply green in terms of foliage. But I have never had a problem with tobaccos. The humidity lets me leave it un-jarred if I am smoking it regularly but doesn't seem to dampen the burn. I'd go for the mug warmer for simplicity.
I know what I like. Been shmerkin pipes half my life. I prefer almost crispy. In fact, crispy is sometimes even better depending on the cut. Typically for the few topped blends i might smoke, if it stays clumped when pinched hard, it'll burn too hot for me.
Science guy here. I have a 2 compartment Tupperware style plastic tub I use to wring excess moisture out of Gawith flakes. Flakes in one side, silica gel on the other. The silica gel is available in hardware stores, and pet stores sell it for litter boxes.
It can be recycled by baking in oven. (Except when used in litter box.)
On a summer camping trip a few years ago when it was particularly humid, I resorted to folding a couple of flakes in a piece of paper towel and placing it over my truck’s windshield defroster vents and cranking the A/C while I went on a beer and ice run into town. Worked like a charm