Datasets for Indices of Climate Extremes

Project Overview - CLIMDEX

ClimdEX is a project that produces a suite of in situ and gridded land-based global datasets of indices representing the more extreme aspects of climate. Indices are derived from daily temperature and precipitation data using the definitions recommended by the CCl/CLIVAR/JCOMM Expert Team on Climate Change Detection and Indices (ETCCDI).

Aims of this Web Site

The main purpose of this website is to:

  • Provide easy access to climate extremes data for research purposes
  • Assess spatial and temporal variability of climatic extremes
  • Assess uncertainties in the representation in extremes
  • Evaluate climate model output (with knowledge of the uncertainties in the observational datasets)
  • Provide traceability for data and methods used

This site provides access to datasets, including detailed information on their construction, (revision-controlled) software, trend maps, time series, and uncertainty estimates. The datasets are aimed at researchers who are interested in assessing global and regional variability and trends in climatic extremes or who wish to assess global climate model output. Station-based datasets are available from the start of operation of the station (where data are available) to present (where available). The start and end date of the gridded datasets varies. Operationally updated datasets (e.g. GHCNDEX) are updated monthly. The dataset which best suits your purpose will depend on your application. You should read the notes on this website and the literature associated with each dataset  prior to using it in order to make the best choice.