Bogotá is the third-highest capital in South America, after La Paz and Quito. It sits at an altitude of about 2600m; at this height altitude sickness can occur. You may feel a bit dizzy when you arrive. Take it easy for a day or two - it should soon go away.
The main dry season lasts from December to March, and there is also a second, less dry period with only light rainfall from July to August. The wettest months are April and October. The mean annual rainfall is about 1020mm.
The city's average temperature is 14°C year-round, dropping to about 9°C at night and rising to around 18°C (higher on sunny days) during the day. In the rainy season there is less difference between daytime and nighttime temperatures.