SEASONS IN INDONESIA

Area Wet Months ***** Dry Months

Java: October-April ****** May-September
Bali: October-March *****April-September
Sumatra: October-April ***** May-September
Nusa Tenggara: November-February ***** March-October
Celebes / Sulawesi: November-March ***** April-October
Maluku & The West Papua: April-July ***** Augustus-March
Borneo / Kalimantan: November – February ***** March – Oct

The primary climate of Indonesia is not temperature or air pressure, but rainfall. Almost 81 percent of the area of ​​Indonesia has fairly constant temperatures. Divided by Ecuator, the archipelago is almost entirely tropical climate with the coastal plains averaging 28 ° C, the interior and mountain areas averaging 26 ° C, and high mountain regions, 23 ° C. Relative humidity of the region varies from 70 to 90 percent. Winds are generally moderate and predictable, usually with the monsoons that blow in the south and east from June to September and the northeast from December to March. Typhoons and storms of scale are not a threat to marine waters in Indonesia, the greatest danger comes from swift currents in channels such as the Straits of Lombok and Sape.

Extreme variations in rainfall are associated with the monsoon. There is generally a dry season (June to September), influenced by Australian air masses, and a rainy season (December to March) is the result of continental Asia and the Pacific Air masses. Western Sumatra, Java, Bali the interior of Kalimantan, Sulawesi and Irian Jaya is the wettest areas of Indonesia in a predictable manner, with a rainfall of more than 2,000 millimeters per year. In part, this moisture comes from a strategic location in the high peaks of the trap moisture in the air. The city of Bogor, near Jakarta, says that more global rainfall per year – 322. On the other hand, the islands closest to Australia – including Nusa Tenggara and the eastern tip of Java – tend to be dry, some regions have less than 1,000 millimeters per year.

To complicate matters, some of the South Moluccas experience highly unpredictable rainfall, depending on local air currents. Located in Ecuador, the archipelago experiences relatively little change in the length of daylight hours from one season to another, the difference between the longest day and shortest day of the year just 48 minutes. The archipelago stretches across three time zones: Western Indonesia Time – seven hours ahead of Greenwich Mean Time (GMT) – includes Sumatra, Java, Kalimantan and East Indonesia Time Central – eight hours head of GMT – includes western Kalimantan, Sulawesi and Nusa Tenggara, Indonesia and this time – nine hours ahead of GMT – includes the Moluccas and Irian Jaya. The boundary between the Western and Central time zones – established in 1988 – is a line to the north between Java and Bali through the center of Kalimantan. The border between the central and Eastern Time zone extends north of the eastern tip of Timor to the eastern tip of Sulawesi.