If you look at the mean temp and see it's below zero then things will probably stay frozen or freeze more:
http://climate.weather.gc.ca/climateDat ... &cmdB1=Go#As you can see it's been well below 0 in Whistler for the past long while, only in the past couple days are we approaching warmer temps. Once the temps warm up it takes quite a while before the ice melts, just as it takes weeks below zero for the ice to freeze.