Maitreyee Bera 20220907 The data are available as a tab-delimited text file (.txt) from the link https://www.sciencebase.gov/catalog/item/626069a3d34e85fa62b8918c and as a Watershed Data Management (WDM) database format (.wdm) file from the link https://www.sciencebase.gov/catalog/item/62606a87d34e85fa62b8919f. Denver, CO U.S. Geological Survey https://doi.org/10.5066/P9BBP9EJ The text file "Air temperature.txt" contains hourly air temperature data in degrees Fahrenheit and associated data-source flags from January 1, 1948, to September 30, 2021. The primary data for water year 2021 (a water year is the 12-month period, October 1 through September 30, designated by the calendar year in which it ends) were downloaded from the Argonne National Laboratory (ANL) (Argonne National Laboratory, 2022) and they were processed following the guidelines documented in Over and others (2010). The processed data were appended to ARGN20.WDM (Bera, 2021) and renamed as ARGN21.WDM. Missing and apparently erroneous data values were replaced with adjusted values from nearby weather stations used as “backup”. The Illinois Climate Network (Water and Atmospheric Resources Monitoring Program, 2022) station at St. Charles, Illinois, was used as "backup." Each data source flag is of the form "xyz", which allows the user to determine its source and the methods used to process the data (Over and others, 2010). References Cited: Argonne National Laboratory, 2022, Meteorological data, accessed on January 17, 2022, at https://www.atmos.anl.gov/ANLMET/numeric/. Bera, M., 2021, Meteorological Database, Argonne National Laboratory, Illinois, January 1, 1948 - September 30, 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9GP8COF. Over, T.M., Price, T.H., and Ishii, A.L., 2010, Development and analysis of a meteorological database, Argonne National Laboratory, Illinois: U.S. Geological Survey Open-File Report 2010-1220, 67 p., http://pubs.usgs.gov/of/2010/1220/. Water and Atmospheric Resources Monitoring Program. Illinois Climate Network, 2022. Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61820-7495. Data accessed on January 4, 2022, at http://dx.doi.org/10.13012/J8MW2F2Q. This data set may be used to run the Hydrological Simulation Program- FORTRAN (HSPF) model or any other compatible model for simulating rainfall-runoff in DuPage County and nearby areas in northeastern, Illinois. This database is available to public and other stakeholders for the purpose of doing rainfall-runoff modeling or similar analyses. 19480101 20210930 publication date Planned Annual -87.8948 -88.0948 41.8014 41.6014 Meteorological Database, Argonne National Laboratory, Illinois air temperature hydrology runoff data-source flag flood forecasting USGS Metadata Identifier USGS:626069a3d34e85fa62b8918c Illinois Argonne National Laboratory, Illinois DuPage County, Illinois O'Hare International Airport, Illinois St. Charles, Illinois DeKalb, Illinois none none Maitreyee Bera USGS Central Midwest Water Science Center Hydrologist mailing and physical

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Urbana Illinois 61801-2347 USA 217-328-9749 mbera@usgs.gov Argonne National Laboratory staff who collected the primary data; Jennie Atkins, the Director of the Water and Atmospheric Resource Monitoring (WARM) program (Water and Atmospheric Resources Monitoring Program, 2022), for providing the hourly air temperature data from the stations at St. Charles and DeKalb, Illinois. No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted Hourly values of air temperature in degrees Fahrenheit from October 1, 2020, to September 30, 2021, were downloaded from Argonne National Laboratory (Argonne National Laboratory, 2022) and the were processed following the guidelines documented in Over and others (2010). The processed data were appended to ARGN20.WDM (Bera, 2021) and renamed as ARGN21.WDM. Missing and apparently erroneous data values were replaced with adjusted values from nearby stations used as "backup." The Illinois Climate Network (Water and Atmospheric Resources Monitoring Program, 2022) station at St. Charles, Illinois, was used as "backup." Each data source flag is of the form "xyz", which allows the user to determine its source and the methods used to process the data (Over and others, 2010). References Cited: Argonne National Laboratory, 2022, Meteorological data, accessed on January 17, 2022, at https://www.atmos.anl.gov/ANLMET/numeric/. Bera, M., 2021, Meteorological Database, Argonne National Laboratory, Illinois, January 1, 1948 - September 30, 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9GP8COF. Over, T.M., Price, T.H., and Ishii, A.L., 2010, Development and analysis of a meteorological database, Argonne National Laboratory, Illinois: U.S. Geological Survey Open-File Report 2010-1220, 67 p., http://pubs.usgs.gov/of/2010/1220/. Water and Atmospheric Resources Monitoring Program. Illinois Climate Network, 2022. Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61820-7495. Data accessed on January 4, 2022, at http://dx.doi.org/10.13012/J8MW2F2Q. 20220419 NAME DESCRIPTION Year: Year of sample Month: Month of sample Day: Day of sample hh: Hour of sample mm: Minute of sample Data: Air temperature in degrees Fahrenheit Flag: three-digit data-source flag in the form "xyz" http://dx.doi.org/10.5066/P9BBP9EJ U.S. Geological Survey - ScienceBase U.S. Geological Survey mailing and physical

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Denver Colorado 80225 USA 18882758747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Watershed Data Management (WDM) NA NA DSN 400 contains the hourly air temperature data in degrees Fahrenheit and DSN 410 contains the associated three-digit data-source flag 20.0 https://doi.org/10.5066/P9BBP9EJ File is available to download free of charge. NONE The Text file can be opened by any text editor or MS Excel. To open the Watershed Data Management (WDM) Database file, the user needs to install the utility described in the section "Related External Resources" from the page at the link https://www.sciencebase.gov/catalog/item/62606a87d34e85fa62b8919f. 20220907 Maitreyee Bera USGS Central Midwest Water Science Center Hydrologist mailing and physical

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Urbana Illinois 61801-2347 USA 217-328-9749 mbera@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998