The two major attractions that affect your decision of traveling to Zambia will be the best time to go on safari in Zambia and the best time to see the Victoria Falls.
The Dry Season or is always preffered for safaris as vegetation is thinner and animals concentrate around waterholes.
The West season is November to April, when dirt roads close and parks become impassable. In South Luangwe National Park, the Mfuwe sector's sandy soil and all-weather roads make it accessable year-round.
Victoria falls is most popular from June to September, when the spray is mediocre and the spray does not block your view of the falls.