The general height of the land gives Zambia a more pleasant climate than that experienced in most tropical countries. There are three seasons – cool and dry from May to August, hot and dry from September to November, and warm and wet from December to April. Only in the Valleys of the Zambezi and Luangwa is there excessive heat, particularly in October and, in the wet season, a high humidity.
According to Population Pyramid of the World the total population of Zambia is 15 519 000 in 2015, compared to only 2 340 000 in 1950. The proportion of children below the age of 15 in 2010 was 46.4%, 50.6% was between 15 and 65 years of age, while 3.1% was 65 years or older.