I am interested in work with climate data since 2012, I found it in http://www.worldclim.org/version1, but there is something draws my attention:

There it says: "Current conditions (interpolations of observed data, representative of 1960-1990)"

Does it mean the current data is something like a "temporal projection" based in data of 1960-1990? or

Should I understand it like an interpolation of weather stations existing since 1960 with not including stations existing since 1990?

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