It does very greatly from place to place; Alaska has startlingly varied geography and that greatly influences the temperatures. Along the southern coast and in the Panhandle it doesn’t get much below freezing; that area is sort of like Western Washington State. In the Interior, it can get down to -82 F; the coldest I saw in the Copper Basin was -66 F (but the month of January rarely saw anything above -40 F). Anchorage is pretty much the same as many of the northern Lower 48 states during the winter (but much nicer during the summer). Along the northern and Western coasts of Alaska, the thing to watch out for is more the wind chill factor than the actual temperature.