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I have downloaded ERA5 2m-Temperature already.
era5_t2m.nc

I want to
Calculate the mean of all months of each year separately
Split the data as 12 different files for all months
Cut/Crop the Turkey from global file
Calculate the mean of all seasons of each year separately
Differences between two files
Normally I should use a programming language to open, read and manipulate the data like R, Python, NCL or etc.
Calculate the mean of all months of each year separately: yearmonmean
Split the data as 12 different files for all months: splitmon
Cut/Crop the global file for just Turkey: sellonlatbox
Calculate the mean of all seasons of each year separately: seasmean
You can use it in Terminal or Python. (Download it with Anaconda or Cygwin)


era5_t2m.nc

cdo yearmonmean era5_t2m.nc era5_t2m_yearmonmean.nc
era5_t2m_yearmonmean.nc

cdo splitmon era5_t2m.nc era5_t2m_splitmon
era5_t2m_splitmon10.nc

cdo sellonlatbox,26,-45,36,42 era5_t2m.nc era5_t2m_TR.nc
era5_t2m_TR.nc

cdo seasmean era5_t2m.nc era5_t2m_seasmean.nc
era5_t2m_seasmean.nc

ncdiff era5_t2m_splitmon03.nc era5_t2m_splitmon04.nc era5_t2m_splitmon0304_ncdiff.nc
era5_t2m_splitmon0304_ncdiff.nc

You can use it in Terminal and Python ( also download with Anaconda)




