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The climate of Indonesia is almost entirely tropical. The uniformly warm waters that make up 81% of Indonesia’s area ensure that temperatures on land remain fairly constant, with the coastal plains averaging 28 °C (82 °F), the inland and mountain areas averaging 26 °C (79 °F), and the higher mountain regions, 23 °C (73 °F).
Temperature varies little from season to season, and Indonesia experiences relatively little change in the length of daylight hours from one season to the next; the difference between the longest day and the shortest day of the year is only forty-eight minutes. This allows crops to be grown all year round.
The main variable of Indonesia’s climate is not temperature or air pressure, but rainfall. The area’s relative humidity ranges between 70 and 90%. Winds are moderate and generally predictable, with monsoons usually blowing in from the south and east in June through September and from the northwest in December through March.