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Quality Controlled Datasets

Selected subsets of hourly, daily, and monthly USCRN/USRCRN observations have been made available as text files for easy access by users ranging from the general public to science experts. The most popular air temperature, precipitation, solar radiation, surface temperature and soil moisture / soil temperature data are available The hourly02 data files include some raw data with quality flags, as well as calculated variables that are set to missing if source data do not pass quality control tests. The daily01 and monthly01 data are calculated only if sufficient amounts of raw data that pass quality control tests are available; otherwise data values are set to missing.


product icon Monthly01

The Monthly01 ftp directory contains USCRN monthly temperature, precipitation, global solar radiation, and surface infrared temperature data in easy to read text formats. Each of the files in this directory contains the period-of-record monthly data for the station in the file name. More detailed descriptions of the variables and their calculation rules are in the detailed information link below.

Monthly01 data | Detailed information | FTP client access
product icon Daily01

The Daily01 ftp directory contains USCRN daily temperature, precipitation, global solar radiation, and surface infrared temperature data in easy to read text formats. In the updates subdirectory, there is a record of the real time daily data transmitted over NOAAPORT (SXXX91 CRND01). Each of these files contains all daily data for all stations for one day. For those seeking USCRN daily station data in bulk, each of the year subdirectories (such as 2009 or 2010) contains a station-year file for each station, allowing for rapid access to all station daily data for a year.

Daily01 data | Detailed information | FTP client access

product icon Hourly02

The Hourly02 ftp directory contains USCRN hourly temperature, precipitation, global solar radiation, and surface infrared temperature data in easy to read text formats. In the updates subdirectory, there is a record of the real time hourly data transmitted over NOAAPORT (SXXX91 CRNH02). Each of these files contains all daily data for all stations for one day. For those seeking USCRN hourly station data in bulk, each of the year subdirectories (such as 2009 or 2010) contains a station-year file for each station, allowing for rapid access to all station hourly data for a year.

Hourly02 data | Detailed information | FTP client access

product icon Subhourly01

The Subourly01 The Subhourly01 ftp directory contains USCRN 5-minute temperature, precipitation, global solar radiation, surface infrared temperature, relative humidity, soil moisture and temperature, wetness, and 1.5 meter wind data in easy to read text formats. Each of the year subdirectories (such as 2009 or 2010) contains a station-year file for each station, allowing for rapid access to all 5-minute station data for a year.

Subhourly01 data | Detailed information | FTP client access

product icon Soilsip01

The Soilsip01 ftp directory contains an intermediate product providing initial access to the new soil moisture and soil temperature data beginning to be collected at USCRN stations. This is a temporary product that will be eventually superseded by a more complete soil moisture and soil temperature product set. Available currently are comma-separated (CSV) files named for each station with soil probes. A file contains one header row, followed by lines of data for the station's soil moisture/soil temperature hourly averages gathered since instrument installation.

Soilsip01 data | Detailed information | FTP client access

product icon Visualizations

We also offer several visualizations which can be used as analysis tools. These include several graphs, a solar radiation map, and unique soil moisture tools. Visit our visualizations page for more information.



Frequently Asked Questions

FAQ icon How do I read the ftp data files?
FAQ icon In each product folder there is a README.txt file that explains the file layouts and how to read the data within the files. You may use an ftp client to download the files; however, most modern browsers will also download them.

FAQ icon Which ftp data files should I select?
FAQ icon The files in the year subdirectories contain the entire set of data for a station-year and are updated approximately weekly. The entire period of record for all stations is available for download in the snapshots folder. The updates subdirectory contains updates to these periods of record as files named by the date and time they represent as they are distributed through NOAAPORT. For more information, see the README.txt file.

FAQ icon How are hourly, daily, and monthly values calculated in USCRN quality controlled datasets?
FAQ icon USCRN observations are processed using calculation approaches and rounding methods advised by the National Data Stewardship Team, a group of weather and climate data experts from NCDC, NWS, USDA, universities, and state climate offices.

FAQ icon Why do some stations not report global solar radiation or surface infrared temperature data?
FAQ icon The U.S. Regional Climate Reference Network (USRCRN) stations do not carry solar and surface IR instruments like the U.S. Climate Reference Network (USCRN) stations. USRCRN stations currently focus solely on temperature and precipitation measurements.

FAQ icon Why are there no wind reports in ftp products?
FAQ icon The wind instrument on a USCRN station tower is mounted at the same height as the air intakes to the temperature sensors, which is usually 1.5 meters above the ground. The wind speed instruments were deployed for studying the environments of the temperature measurements, and are not comparable to the 10-meter wind measurements with which most people are familiar which are taken at airports. To avoid confusion, these data are not included in the ftp files, but can be seen in the Reports web tool.

FAQ icon Where can I find 5-minute data?
FAQ icon Some 5-minute data are available in the NCDC Climate Data Online system in the Quality Controlled Local Climate Data Products for USCRN stations listed at http://cdo.ncdc.noaa.gov/qclcd/QCLCD. Bulk transfers of 5-minute data for research purposes are best handled by NCDC Customer Service at http://www.ncdc.noaa.gov/oa/about/ncdcordering.html. USCRN contacts can also help direct persons with special requests; contacts are listed at the bottom link on the blue navigation bar to the left.