Russell,
Our climate is probably somewhat similar to yours. We're in the mountains and I believe you're in the prairie (?with pothole lakes), but we get some pacific weather effects and you're colder and continental in the winter, probably. Anyway...
I wax the outside of roughed bowls, place in a closed paper grocery bag, and place on a ventilated shelf (metal or plastic with a grid rather than a solid shelf) open side of bowl in bag down. Usually 2 bowls to a bag unless small and then there might be 4-5 in the bag. This is in my basement with an ambient temp, year round, of about 65 degrees. After 5 months, I take out and place on the shelf outside the bag for a month or two, then flip upright and stack for later use.
My good friend takes a paper leaf bag sold at hardware stores and fills it with roughed blanks, maybe 15 give or take, usually not waxed, folds the top and lets them sit on the floor of his basement until he's ready for them. Generally 6 months or so.
If you're short on storage space in your shop, you might find an even better place for storing until dry out in the garage or a shed, or in the basement. Some place out of the artificial heat, anyway. Our living area indoor winter humidity is in the teens and would probably dry the blanks too fast.
There are a great many ways to slowly dry the blanks and you'll figure out your own favorite method in time.