The USHCN data and user interface have been updated.
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Daily Temperature, Precipitation, and Snow Data

C.N. Williams, Jr., M.J. Menne, R.S. Vose, and D.R. Easterling
National Oceanic and Atmospheric Administration,
National Climatic Data Center,
Asheville, North Carolina

Prepared for on-line distribution by:
B.L. Jackson, L.M. Olsen, D.P. Kaiser, Erika Soderstrom, and T.A. Boden
Carbon Dioxide Information Analysis Center
Environmental Sciences Division
Oak Ridge National Laboratory
Oak Ridge, Tennessee 37831-6290
managed by
University of Tennessee-Battelle, LLC
for the
under contract DE-AC05-00OR22725

Data Citation

Williams, C.N., Jr., M.J. Menne, R.S. Vose, and D.R. Easterling. 2006. United States
          Historical Climatology Network Daily Temperature, Precipitation, and Snow Data.
          ORNL/CDIAC-118, NDP-070. Available on-line [] from the
          Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of
          Energy, Oak Ridge, Tennessee. doi: 10.3334/CDIAC/cli.ndp070

1. Background Information
2. Description of the Data
3. Data Inhomogeneities and Nonclimatic Influences in the Data
4. Quality assurance of the HCN/D database
5. File Descriptions
6. How to Obtain the Database and Documentation
7. References
Appendix B: State Numbers and abbreviations Used for the 48 States in the HCN/D Database

Access Station Data

Users are urged to read a brief
overview regarding missing daily data values and questionable data values which may or may not have been flagged via the quality assurance procedures applied to USHCN daily data.

There are now two ways to get station data:

1. Download netCDF (network Common Data Form) files containing data for the entire USHCN network (by variable type), or download and view state files in ASCII format from CDIAC's ftp area.

You may also download an ASCII text version of the documentation file (ndp070.txt) and the station inventory file (invent.txt) .

2. In addition to browsing and downloading data for an entire state, you may also query, plot, and download data for individual states or stations using our web interface. CDIAC developed this interface using SAS Internet TM. (Note: Please review all documentation before using these data.)

Click on a state to retrieve daily station data.

(Switch to USHCN Monthly Data Page)

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