Rainfall can occur at any time of the year but is higher in the mountainous areas where there is very little distinction between the wet and dry seasons. Central Indonesia is the driest area. Due to its southerly position, Indonesia is not prone to cyclones or typhoons but thunderstorms are quite common. Carry a lightweight jumper as it can be chillingly cold inside air-conditioned buildings. Haze is difficult to predict, however efforts are being made to prevent a recurrence of the severe hazes of 1996 and 1997.
Rain is common year round with no real distinction between the wet and dry seasons.
Temperatures remain constant throughout, although warmer clothes are required in the mountainous regions where temperatures can drop well below the average. This area remains hot and humid year round, with temperatures holding at around 30 o C . The western monsoon brings the heaviest rain between December and March - rain normally falls in intense showers for a short period only. Moving closer to the mountains, skies become cloudier and showers more frequent but the climate is always pleasant. In the higher climes, temperatures fall and visitors will definitely need either a sweater or jacket after sunset.