Andy, If the compound stiffens from the cold there is probably nothing you can do but let the fork tubes float inside them to eliminate the flex. Sure, you could warm them before you ride, but the air would chill them back down in no time at those temps. Anything you would try to treat them with would have to infiltrate the rubber right to the core. I will be up there next week for a couple or days next week and a few days week after. I too hope it warms up.