I didn't do the conversions to Fahrenheit, but heat is the biggest killer to glue. Want to remove glue? Apply heat!
What I would recommend doing is venting your tarp as best as possibly. I face the same challenge and vent mine front and back. I do this by using a plastic stick similar to a piece of wood that would also work, and tie a rope from that wood just in front of the bow all the way over the top of the outboard. This creates a way for hot air to easily escape on either end. In fact on my high side (My driveway is a slope) I put a cross bar to keep the tarp open. I use a bunch of quick clamps from the hardware store to hold the tarp in place thru wind, rain, and everything else.
Ideally you want a "shed" type canopy that stands off the boat to let the heat escape.