mean daily NMC Reanalysis (1948)
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 air_pressure
1-daily data available from 01Jan1948 to 02Dec2019 ( 26323 times)
Variable hgt (mean Daily Geopotential height) in m
Full metadata.

Get grid points, average area or generate subset

Mask:	no mask   add a mask to the list
Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average max min 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) biannual seasonal monthly 10-daily 5-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
First apply:	-day running mean
Missing data:	ignore, climatology, trend, persistence.

Create a field with lower spatial resolution

Average over blocks of longitude and latitude grid cells

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 257.077 MB).