We got caught in a snow/ice storm couple years ago in N/W New Mexico.
Couple of inches of snow during during the night then just enough sun to melt and turn to ice then repeat for next two days.
Morning we left I had to do the slip and slide on roof with a garden hose to melt the ice off top of slides...........other than landing on my rear end when feet slipped out from under me do problem with slides.
Been in snow storm that dumped 2' of snow.......no problems
Just clear top and seals before retracting......and place a couple of towels under the sides when in to catch any melt/run off.
Safe bet is to retract them when snow/ice storms coming.....IF you can. We FT so slides are out all the time except for travel days.