The wet season in Madagascar is also the hottest time of the year, with temperatures hitting a daily average maximum of 28º C (82º F) in December with a daily low of 17º C (63º F). July is the coolest month with daily average temperatures ranging between a 21º C (70º F) and 9º C (48º F).The daily temperature range averages around 8 º C (46º F) year-round. Indian Ocean trade winds dictate the Madagascar climate, bringing with them variations in precipitation throughout the region.he Madagascar climate is hot and sub-tropical, it is colder in the mountains, while the south and west regions are particularly dry.