Abstract: The "classic" derived by Bram Oort from MIT, GTS, ETAC, NCDC and NCAR data. See also DS431.0 [http://rda.ucar.edu/datasets/ds431.0]. Unless you have a special interest in this dataset, DSS recommends that you use one of our reanalysis datasets, such as ds090.2 [http://rda.ucar.edu/datasets/ds090.2]. That's because those are based on a more complete collection of observations, improved analysis methods, and are provided in a common modern format (GRIB).
Data Set Citation
UCAR/NCAR/CISL/DSS > Data Support Section, Scientific Computing Division, National Center for Atmospheric Research, University Corporation for Atmospheric Research