IPCC Climate Change Data: 1961-1990, Wind

From the IPCC website: The CRU Global Climate Dataset
available through the IPCC DDC consists of a multivariate 0.5
degree latitude by 0.5 degree longitude resolution mean monthly
climatology for global land areas, excluding Antarctica,
strictly constrained to the period 1961-1990. The mean
1961-1990 climatology comprises a suite of eleven surface
variables: precipitation (PRE) and wet-day frequency (WET);
mean, maximum and minimum temperature (TMP, TMX, TMN); diurnal
temperature range (DTR); vapour pressure (VAP); global radiation
(RAD); cloud cover (CLD); frost frequency (FRS); and wind speed
(WND). The mean climate surfaces have been constructed from a
new dataset of station 1960-1990 climatological normals,
numbering between 19,800 (precipitation) and 3615 (windspeed).
The station data were interpolated as a function of latitude,
longitude and elevation using thin-plate splines. The accuracy
of the interpolations are assessed using cross-validation and by
comparison with other climatologies. This dataset has been
described in: New, M., Hulme, M., and Jones, P.D. (1999)
Representing twentieth century space-time climate variability.
Part 1: development of a 1961-90 mean monthly terrestrial
climatology J. Climate 12, 829-856.