1

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)"

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

or

  1. Should I understand it like an interpolation of weather stations existing since 1960 with not including stations existing since 1990?
  • I think that this is a question that may be more suitable for researching at the Open Data Stack Exchange. – PolyGeo Nov 27 '16 at 0:20
  • Note that current is not "now". At best, its current to the publication date. Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones and A. Jarvis, 2005. Very high resolution interpolated climate surfaces for global land areas.. So 2005 'current'. – BradHards Nov 27 '16 at 3:04
3

The methods in the 3rd paragraph of your link state:

The data layers were generated through interpolation of average monthly climate data from weather stations on a 30 arc-second resolution grid (often referred to as "1 km2" resolution). Variables included are monthly total precipitation, and monthly mean, minimum and maximum temperature, and 19 derived bioclimatic variables.

[snip...]

For stations for which we had records for multiple years, we calculated averages for the 1960-90 period. We only used records for which there were at least 10 years of data. In some cases we extended the time period to the 1950-2000 period to include records from areas for which we had few recent records available (e.g., DR Congo) or predominantly recent records (e.g., Amazonia).

So your 2nd option is closest. They averaged records for each month for each climate variable for the period 1960-1990 (with some exceptions), then spatially interpolated the averages and called that "current".

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