The main variable of Singapores climate is not temperature or air pressure, but rainfall. Singapores climate can be described as tropical climate, with an annual average Temperature around 28°C, with daytime Temperatures of 35°C and more, and minima around 20°C. The area's relative humidity is quite high, and ranges between 70 and 90 percent, the high humidity can make it quite uncomfortable.
The extreme variations in rainfall are caused by the monsoons. Generally speaking, there is a dry season (June to September), and a rainy season (December to March). Precipitation is quite high, and varies from 1000-1500 mm per year.
Typhoons can hit Singapore from July to mid November, and can sometimes cause heavy damage, flooding and erosion. However, In general Typhoons prefer other routes, and are quite seldom in Singapore.