xarray data array に対して，以下のように簡単に気候値と偏差を求めることができる．ここでsst_raw_xaはSSTの生値(raw value)のxarray data array である．
climatology = sst_raw_xa.groupby('time.month').mean('time')
sst_anm_xa= sst_raw_xa.groupby('time.month') - climatology
We can very easily calculate climatology and anomalies using xarray. In the following example, sst_raw_xa is an xarray data array containing raw values.
climatology = sst_raw_xa.groupby('time.month').mean('time')
sst_anm_xa= sst_raw_xa.groupby('time.month') - climatology