This prophecy speaks of a period of time when winters will become very cold, very bitter, very harsh.  Days and weeks of incredible cold around the world, as well as in strange and unusual places, or places that don't normally get cold will get large amounts of it.  Unusually large amounts of ice and snow will appear that will blanket some areas in heavy volumes of white.  Areas that don't normally get snow, will get snow.  The weather in the earth, in general, will turn colder, not warmer.  These will be used as a judgment, and to reign in certain types of unrest and evil within the nations, while judging others.  Some of this snow shall even be used to cleanse the nations (not sure if this refers to spiritual, or physical) and purify them.