 

Field
CRU TS4.03 cloud fraction
CRU TS4.03 Cloud Cover
X axis: whole world in 720 0.50° steps, first point at 179.75° W, last point at 179.75° E Y axis: regular grid with 360 0.50° steps, first point at 89.75° S, last point at 89.75° N Monthly data available from Jan1901 to Dec2018 (1416 months) Variable cld (cloud cover) in percentage Full metadata. The associated land/sea mask is available for some operations Construct a statistical forecast model from this field Compute anomalies
Compute zonal mean
If you really want to get it here, CRU TS4.03 cloud fraction is available as a netcdf file (size 192.026 MB). 
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