This is a data set of mean monthly surface climate measurements over global land areas, excluding Antarctica, for the period 1961-1990. Values were interpolated from station data to a 0.5 degree latitude/longitude grid for several climatic parameters: precipitation and wet-day frequency, mean temperature and diurnal temperature range (from which maximum temperature and minimum temperature can be determined), vapour pressure, sunshine, cloud cover, ground-frost frequency and windspeed.
A description of the data files is provided as a companion file.
For a complete documentation of the dataset, see New et al, 1999. Also refer to IPCC Data Distribution Centre.
Cite this data set as follows (citation revised on June 27, 2002):
New, M., M. Hulme, and P. D. Jones. 2000. Global 30-Year Mean Monthly Climatology, 1961-1990 (New et al.). Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A., doi:10.3334/ORNLDAAC/542.
New, M. G., M. Hulme, and P. D. Jones. 2000. Representing twentieth century space-time climate variability. Part 1: Development of a 1961-1990 mean monthly terrestrial climatology. Journal of Climate 12:829-856.