I am assuming that the colonies are normal otherwise, that is they have queens, a good population and are not under heavy disease or mite stress. It is certainly possible for bees to have eaten up much of their stores with the prolonged spell of wet weather. This is especially true of Italian colonies. If they are indeed pulling out worker brood (drone brood starts to get pulled around this time of year anyway), then immediate feeding is necessary.
Go with a 2:1 sugar to water, top feed (avoid entrance feeders as this will promote robbing), with the feeder well protected from the weather and other bees. Make sure all extra supers are off the hives. This may have to go on for quite awhile, as they will need 50-60 pounds ideally, to make it through the winter. Let me know if you have other questions.
Stephen G. Parise
Agriculture Resource Management Specialist/apiculturist
Vermont Agency of Agriculture, Food & Markets
116 State Street
Montpelier, VT 05620-2901