Here's an FAQ about climatologies.
For a seasonal climatology, it is just a matter of choosing a
seasonal climatological axis - or defining your own custom
climatological axis - and setting up an _expression_ that uses a
regridding transformation as in the FAQ. We have just added to the
documentation about modulo regridding, to include some discussion
about seasonal climatologial axes that are available,
On 5/23/2018 11:02 PM, USHNANSHU DUTTA
I want to make a seasonal climatological(JJAS) time
series of 30 years from a daily data of 30 years.
Institute of Tropical Meteorology