Climate
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The climate and weather of Indonesia is characterized by two tropical seasons, which vary with the equatorial air circulation (The Walker Circulation) and the meridian air circulation (The Hardley Circulation). The displacement of the latter follows the north-south movement of the sun and its relative position form the earth, in particular from the continents of Asia and Australia, at certain periods of the year. These factors contribute to the displacement and intensity of the Inter-Tropical Convergence Zone (ITCZ) which is an equatorial trough of low pressure that produces rain. Thus, the west and east monsoons, or the rainy and dry seasons, are a prevalent feature of the tropical climate.

The Main Seasons
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The climate changes every six months. The dry season (June to September) is influenced by the Australian continental air masses; while the rainy season (December to March) is the result of the Asian and Pacific Ocean air masses. The air contains vapor which precipitates and produces rain in the country. Tropical areas have rains almost the whole year through. However, the climate of Central Maluku is an exception. The rainy season is from June to September and the dry season from December to March. The transitional periods between the two seasons are April to May and October to November.

Temperature and Humidity
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Due to the large number of islands and mountains in the country, average temperatures may be classified as follows:

Being in a tropical zone, Indonesia has an average relative humidity between 70% and 90%, with a minimum of 73% and a maximum of 87%.