The main variable of the Phillippines climate is not temperature or air pressure, but rainfall. In general, the climate of the Phillippines can be decribed as tropical, with the coastal plains averaging year-round temperatures about 28°C. The area's relative humidity is quite high, and ranges between 70 and 90 percent.
The extreme variations in rainfall are linked with the monsoons. Generally speaking, there is a dry season (June to September), and a rainy season (December to March). Western and northern parts of the Phillippines experience the most precipitation, since the north- and westward-moving monsoon clouds are heavy with moisture by the time they reach these more distant regions.
Typhoons can hit the Phillippines from July to mid November, and can sometimes cause heavy damage, flooding and erosion.