Historical climate information plays significant role in facilitating the contextualization and interpretation of future climate projections. Climate variables (temperature and precipitation) can be analyzed at various levels, in terms of trends, seasonality, and spatial variability. In fact, temperature and precipitation exhibit substantial differences from month to month and from one location to another even within the same country, region, or watershed.

The global level gridded climate data for the period of 1901-2016 is provided by the Climatic Research Unit (CRU) of the University of East Anglia (UEA), and reprocessed by the National Center for Atmospheric Research (NCAR) of the University Corporation for Atmospheric Research (UCAR). A Glossary, a Metadata, and a Guide to Read Climate Data Visualizations are provided to facilitate the use of the Climate Change Knowledge Portal (CCKP).

This section provides the options to visualize historical climate data for different timeframes via map and annual cycle chart.