The aim of the International Satellite Cloud Climatology Project" (ISCCP) is to develop a long-term high resolution global data set of cloud parameters. This is done under the umbrella of the "World Climate Research Programme" (WCRP) and "Gloal Energy and Water Experiment" (GEWEX). Data from different satellites sensing the atmosphere of the Earth are used to obtain cloud information which can be used to derive the global cloud coverage, their characteristics and temporal variability as well as their role in the Earths' climate system and its hydrological cycle.
The list of data which is available from ISCCP is impressive (see parameters). It depends on the data product, however. Here we offer ISCCP H-Series HGH = global gridded, 1° resolution, monthly average 3-hourly observations; the ISCCP H-Series HGG data set (as HGH but without the monthly averaging applied = successor of the ISCCP-D1 product) can be obtained on request. HGH is the final level-4 product with monthly temporal resolution and comprises a statistical analysis of the HGG data which in turn are based on the data sets of the individual sensors HGS (see the ATBD and Fig. 2 in Young et al. (2018)).
Available parameters include (among others) coverage (total and of different cloud types), cloud top temperature and pressure, cloud droplet distribution, and opacity. An easy description for the different types of data can be found in the parameter description. More information about the data is given in Young et al. (2018), in the ATBD, and here: https://www.ncdc.noaa.gov/isccp.
Last update of this data set at ICDC: June 13, 2019.