I don't live in NFLD but have hunted there many times around that time. It will start getting cold at that time of year with mornings in the 40-50's The province WILL be wet so footwear is of upmost importance. Shots on caribou are usually pretty close so a 20X scope is not needed. It is a great hunting area. Hope you enjoy.
Try to put your tree stand in a tree with plenty of background cover, keep the prevailing winds for that time of the year to your face, and take care of those pesky squeaks and creaks your stand may have developed while sitting in the shed. A good treestand lube can be made by heating petroleum jelly until it reaches a liquid form. Some hunters have reported success by including a cover scent in this mixture before applying it to their stands.