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   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

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).