 

Field
GHCN/CAMS t2m
GHCN/CAMS 2m analysis (Fan and van den Dool)
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° S, last point at 90.00° N Monthly data available from Jan1948 to Jan2019 ( 853 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 7.14523 MB). 
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