 

Field
GHCN/CAMS t2m
GHCN/CAMS 2m analysis (Fan and van den Dool) averaged over 2x 2 grid boxes
X axis: whole world in 360 1.00° steps, first point at 0.50° E, last point at 359.50° E Y axis: regular grid with 180 1.00° steps, first point at 89.50° S, last point at 89.50° N Monthly data available from Jan1948 to May2020 ( 869 months) Variable tmp2m (2m temperature) in Celsius Full metadata. Construct a statistical forecast model from this field Compute anomalies
Compute zonal mean
If you really want to get it here, GHCN/CAMS t2m is available as a netcdf file (size 46.2322 MB). 
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