monthly mean geopotential height from the NCEP Reanalysis
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° N, last point at 90.00° S
Z at 500.00 millibar
Monthly data available from Jan1948 to Apr2013 ( 784 months)
Variable hgt (Monthly mean geopotential height) in m

Get grid points, average area or generate subset

Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average set of grid points subset of the field
Demand at least:	% valid points in this region

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) seasonal monthly 10-daily 5-daily daily
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of 500mb height
Threshold:	no cut less than greater than m percentile normal 1971-2000
Minimum:	% valid data

Construct a statistical forecast model from this field

Please consider downloading this field from the authoritative site.

If you really want to get it here, NCEP/NCAR 500mb height is available as a netcdf file (size 31.4476 MB).