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01. Originating Centre

Select the name of the institution the forecasting system of your interest originates from.

02. System

Select the version of the forecasting system. This is a numeric label and the available values are different for the different "originating centres".
A full description of the use of the system keyword is available from the "Documentation" tab.

03. Variable

Select the parameter(s) you are interested in.

04. Pressure Level

Select the pressure level(s) for the variables you are interested in.

05. Product Type

Select the monthly product you are interested in.
Note that the products under the category "Individual members" consist of all available individual ensemble members, while those in the category "Ensemble" have a single value for each forecast system ensemble.

06. Year

Select the year of the initialization date of the model run(s) you are interested in.
Note that anomalies are just available for real-time forecasts start dates.

07. Month

Select the month of the initialization date of the model run(s) you are interested in.
Note that in the current setup all monthly products are encoded using as nominal start date the 1st of each month, regardless of the real initialization date. You can find more information about how nominal start dates are assigned in the "Documentation" tab.

08. Leadtime Month

Select the lead time(s) you are interested in. This is the time, in months, from the initialization date.
Note that the convention used for labelling the data implies that leadtime_month=1 is the first complete calendar month after the initialization date. In the current setup of all datasets that means that for a forecast initialised on the 1st of November, leadtime_month=1 is November.

09. Geographical area

You can select a global field ("whole available area") or a regional subselection by providing the latitude and longitude of its corners.

10. Format

You can select the data format for your data retrieval.
Currently, just GRIB format is available for C3S seasonal forecast datasets.
An experimental netCDF conversion can be accessed by using the CDS API. You can find some related information in the "Documentation" tab.

11. Terms of Use

You must accept the terms and conditions of the Copernicus User Licence in order to access the C3S seasonal forecast data.