This chapter considers what we know about climate in ancient Greece and how this structures our thinking. The issue of very different local environments and interannual variation is observed, both its challenges but also the potential for exploitation. The question of whether and when climate can be related to history is then discussed –the case of 541 CE and the plague under Justinian is considered as an example of what we do and do not know – and some of the main climate proxy evidence available for ancient Greece are briefly reviewed. The Greek to Roman period is mainly notable for a relatively benign and stable climate regime over a number of centuries.