Daily NOAA-CIRES 20th Century Reanalysis V2c
X axis: whole world in 180 2.00° steps, first point at 0.00° E, last point at 358.00° E
Y axis: regular grid with 91 -2.00° steps, first point at 90.00° N, last point at 90.00° S
Z at 850.00 millibar air_pressure
1-daily data available from 01Jan1851 to 31Dec2014 ( 60024 times)
Variable air (Daily Air Temperature on Pressure Levels) in degK
Full metadata. The associated land/sea mask is available for some operations

Get grid points, average area or generate subset

Mask:	no mask mask10.txt   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
Considering:	everything land points sea points show/hide more only land points only sea points not land points not sea points
Units:	convert to Celsius leave in degK

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 T850
Threshold:	no cut less than greater than degK 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

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, 20C T850 is available as a netcdf file (size 1514.77 MB).