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Model Orography Grafik: A. Will

The CLM-Community is an open international network of scientists, who accepted the CLM-Community agreement in all of its details. Members of the Climate Limited-area Modelling-Community (CLM-Community) are applying and developing the COSMO-CLM or CCLM, which is the COSMO model in CLimate Mode.

The first version of the COSMO-CLM (named CLM) was developed by colleagues from HZG, PIK and BTU Cottbus on the basis of the Local Model (LM) version 3.1 (now COSMO model), originally developed by the German Meteorological Service. The COSMO model is the nonhydrostatic operational weather prediction model applied and further developed by the national weather services joined in the COnsortium for SMall scale MOdeling (COSMO).

In 2005 CLM became the regional Community-Model for the German climate research. This model version has been applied on time scales up to centuries and spatial resolutions between 10 and 50 km in different regions of the world.

In 2007/08 both CLM and LM developments were unified to get a model version for regional climate modelling (COSMO-CLM) and operational weather forecast (COSMO). From this time, the idea of a uniform model version for weather and climate became a guiding principle of the model development.

The unified model version COSMO 5 for weather, climate, and environmental research was released in 2015. An intensive evaluation on a climatological time scale on this version was performed. Since CLM-Community Assembly 2016 the new recommended version of the CLM-Community is the COSMO_5.0_clm6. It comes together with a recommendation for the configurations for the European domain (see figure).

Additional effort is put to further configurations for horizontal model grid widths between 1 and 50 km and other regions of the world.

A comprehensive overview over regional climate modeling (in German) is given in PROMET Volume 99 published in 2017.


An overview about the work of the community is given mainly for non members or beginners. more


People of more than 50 institutions work together in several working groups and a variety of communication ways.
Rules arrange the collaboration.
Become a member



We use COSMO in CLimate Mode and contribute to the model development. more


The main events organized by the community are the yearly Assembly, User Training and the User Seminar. more


The wide use of COSMO-CLM is reflected by in the increasing number of publications. more


Community members have access to the archive of the events, documents, newletter, etc. more



Several new articles have been published: