Like many parts of the Deep South, Vicksburg will get very hot, humid and muggy during the summer months.  The temperature will often go above 90 from June through August, and despite the frequent and strong sunshine, thunderstorms are a fairly regular occurrence.  Such storms may be fairly short lived but can also produce intense downpours that will make driving difficult, if not outright dangerous.
     Winters are very mild, with the temperature dipping into the 30s often, but not necessarily below freezing. Needless to say, snowstorms are not a common occurrence, with winter temperatures often staying above 40 degrees. 
     This is a part of the country where hurricanes are often a major concern in the late summer and early fall. However, Vicksburg is far enough inland for this to usually not be a significant problem.  Spring and fall may be the most pleasant times to visit Vicksburg and other parts of Mississippi, with temperatures often hovering in the 70s and 60s.