The main goal of the “Comparative study of changing climate extremes between China and Europe/Greece based on homogenized daily observations” (CLIMEX) project is to assess the impact of climate change induce climate extremes in temperature and precipitation, both in Greece and in China, by using high quality homogenized data. There are three components to the project, the first component being updating the climate data basis and enhancing data availability and accessibility of long-term and high-quality daily temperature and precipitation climate series for China and Greece. The second component is to define the range of climate variability experienced, to examine recent changes of extreme climate and to quantify the impact of climate change on fundamental meteorological parameters, namely air temperature and precipitation. finally, the third component is to deliver a scientific synthesis and visualization of modern climate conditions in Greece using homogeneous and spatially representative climatic data and high-quality metadata. (Grant No.Contract T7ΔKI-00046)