It can't be as high as in MI though. We're usually around 75-80% in the winter...I found I used the battery up by lunch break the first year of Covid. Wearing a mask while skiing created more fogging in the goggles and the goggle power kicked in to de-fog. I recharged the goggles as I was eating lunch in my vehicle.
I guess I’ll have to spend some time at Whitefish to gather some data. With the lake right there it may indeed have more humidity on the mountain, even more so than the Cascades (not that I would have guessed that).
Since then (no longer wearing a mask out on the slopes) I haven’t experienced any issues. The goggle power lasts all day.
I have a backup pair which I’ve never used, but my SO will try them this holiday trip to Sun Peaks.