Climatologies

CLIX provides the functionality to calculate climatologies of climate indicators using the --average option.

Calculating Climatologies

To calculate a climatology, use the --average option with clixrun:

clixrun --input /path/to/input/file.nc --frequency year --average rge1mm

The output’s time dimension depends on the --frequency argument:

• If --frequency year is used, the result is a single average climatology over the full time period of the input data.

• If a monthly or seasonal frequency is provided (e.g., --frequency month or --frequency season), the climatology will be computed for each month or season over the full period, resulting in a dataset with 12 (monthly) or 4 (seasonal) timesteps.

Specifying a Date Range

The --date_range argument offers further flexibility by allowing you to define the time period for the climatology calculation. Provide a start and end date in YYYYMMDD format.

Example: Monthly Climatology for a Single Period

The command below computes the monthly climatology for wet days between 1990 and 2020:

clixrun --input /path/to/input/dir/ --date_range 19900101 20201231 --frequency month --average rge1mm

Example: Monthly Climatology for Multiple Periods

It’s also possible to use the --date_range argument multiple times to select non-contiguous periods:

clixrun --input /path/to/input/dir/ --date_range 19910101 20201231 --date_range 19610101 19901231 --frequency month --average rge1mm

Important

When multiple --date_range arguments are provided, the --ofile parameter is neglected. CLIX will automatically generate distinct output filenames to prevent overwriting.