 

Field
NCEP/NCAR SLP
monthly mean slp from the NCEP Reanalysis
X axis: whole world in 144 2.50° steps, first point at 0.00° E, last point at 357.50° E Y axis: regular grid with 73 2.50° steps, first point at 90.00° N, last point at 90.00° S Monthly data available from Jan1948 to Feb2019 ( 854 months) Variable slp (Sea Level Pressure) in millibars Full metadata. Compute geostrophic wind components from this field Construct a statistical forecast model from this field Compute anomalies
Compute zonal mean
If you really want to get it here, NCEP/NCAR SLP is available as a netcdf file (size 18.6806 MB). 
© KNMI
