Name the world capitals that have a temperate climate as defined under the Köppen classification system.
A temperate climate is one that is not arid or semi-arid and in which the coldest month has a mean temperature that is at least 0°C (32°F) but less than 18°C (64.4°F).
For a detailed explanation of the Köppen system, including how temperate climates are defined, see this link.
Capitals are as defined in Jetpunk's World Capitals Quiz.