Climatebook.gr is a Greek web portal dedicated to weather, climate, and climate change. Its primary aim is to provide reliable, science-based information on atmospheric and marine conditions, with a particular focus on hydrometeorological phenomena and extreme events. Special attention is given to their impacts and to the broader consequences of climate change in Greece, the Balkans, and Europe. In addition, the portal highlights climate actions and initiatives that address the challenges of climate change, serving as a bridge between scientific knowledge, policy development, and public awareness.