Colombia varies by altitude more than by latitude: Bogota sits above 2,600 metres and stays cool year-round, Medellin holds a mild spring-like climate in its valley, and Cartagena on the Caribbean coast is hot and humid with a walled colonial center.
The guides here cover Colombia as a whole. Because climate follows elevation rather than season, there is no single best time to visit — the drier months in the Andes run December to March and July to August. Security has improved substantially compared with earlier decades, though conditions still differ by region, and current government advisories are the appropriate source for specific areas.