This boots are great for New England weather - not too cold but really wet! If you need boots for very low temperatures you may need to check another model, but I need to say that usually my feet get cold but I'm comfortable in this boots wearing good sock (could be just NE weather). They will keep you always dry, and comfortable.
I usually wear 6.5 or 7, I purchased 7 they fit well with some space to wiggle.