With this application, you can plot COOP observations for a date of your choice.

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Data Listing

# 2018-02-25 High Temperature
# Download From: https://mesonet.agron.iastate.edu/GIS/apps/coop/plot.phtml
# Download Date: 25 Feb 2018
# Data Contact: Daryl Herzmann akrherz@iastate.edu 515.294.5978
#-----------------------snip------------------
        ID,         StationName,      Date,  Latitude, Longitude,      high
     MKTI4,MAQUOKETA 4 W       ,2018-02-25,   42.0667,  -90.7000,        37
     AESI4,AMES 5 SE           ,2018-02-25,   41.9625,  -93.5611,        33
     ROKI4,RED OAK             ,2018-02-25,   41.0000,  -95.2333,        32
     OSEI4,OSCEOLA             ,2018-02-25,   41.0167,  -93.8167,        35
     EKRI4,ELKADER 6SSW        ,2018-02-25,   42.7754,  -91.4537,        35
     LWDI4,LOWDEN              ,2018-02-25,   41.8667,  -90.9333,        39
     CGGI4,COGGON              ,2018-02-25,   42.2792,  -91.5250,        35
     BLVI4,Bellevue LD 12      ,2018-02-25,   42.2667,  -90.4167,        41
     WSHI4,WASHINGTON          ,2018-02-25,   41.2833,  -91.6833,        39
     KEQI4,KEOSAUQUA           ,2018-02-25,   40.7200,  -91.9700,        40
     TLDI4,TOLEDO 3 N          ,2018-02-25,   41.9833,  -92.5833,        35
     BCNI4,BEACONSFIELD        ,2018-02-25,   40.8236,  -94.0439,        33
     GRII4,GRINNELL 3 SW       ,2018-02-25,   41.7167,  -92.7333,        36
     MTAI4,MOUNT AYR           ,2018-02-25,   40.6828,  -94.2944,        33
     MSTI4,MUSCATINE 2 N       ,2018-02-25,   41.4708,  -91.0428,        42
     MSHI4,MARSHALLTOWN        ,2018-02-25,   42.0667,  -92.9333,        35
     SWEI4,SWEA CITY 4 W       ,2018-02-25,   43.3853,  -94.2500,        26
     DNNI4,DONNELLSON          ,2018-02-25,   40.6333,  -91.5667,        42
     FRFI4,FAIRFIELD           ,2018-02-25,   41.0333,  -91.9500,        40
     NWTI4,NEWTON              ,2018-02-25,   41.7000,  -93.0500,        35
     DAKI4,DAKOTA CITY         ,2018-02-25,   42.7200,  -94.1800,        32
     LSXI4,LITTLE SIOUX 2 NW   ,2018-02-25,   41.8167,  -96.0167,        29
     IWAI4,IOWA FALLS          ,2018-02-25,   42.5333,  -93.2667,        33
     AMOI4,Anamosa 3SSW        ,2018-02-25,   42.0763,  -91.3019,        37
       3OI,LAMONI              ,2018-02-25,   40.6233,  -93.9508,        34
     MCWI4,MASON CITY          ,2018-02-25,   43.1500,  -93.1925,        32
     ATLI4,ATLANTIC 1 NE       ,2018-02-25,   41.4181,  -95.0031,        32
     CINI4,CARROLL             ,2018-02-25,   42.0667,  -94.8500,        30
     DLDI4,Dubuque L&D 11      ,2018-02-25,   42.5167,  -90.6500,        36
     TRPI4,TRIPOLI             ,2018-02-25,   42.8131,  -92.2583,        33
     SHDI4,SHELDON             ,2018-02-25,   43.1808,  -95.8528,        23
     EOKI4,Keokuk L&D 19       ,2018-02-25,   40.4000,  -91.3667,        44
     BNWI4,BOONE               ,2018-02-25,   42.0500,  -93.9333,        32
     PERI4,PERRY               ,2018-02-25,   41.8381,  -94.1111,        32
     FYTI4,FAYETTE             ,2018-02-25,   42.8504,  -91.8157,        34
     WMTI4,FORT DODGE 5 NNW    ,2018-02-25,   42.5061,  -94.2011,        32
     HPTI4,HAMPTON             ,2018-02-25,   42.7500,  -93.2000,        33
       DMX,Des Moines WFO      ,2018-02-25,   41.7361,  -93.7233,        22
     SXGI4,SIOUX CITY AIRPORT  ,2018-02-25,   42.3964,  -96.3778,        27
     RKWI4,ROCKWELL CITY       ,2018-02-25,   42.4000,  -94.6167,        35
     WKNI4,Waukon 4SW          ,2018-02-25,   43.2403,  -91.5550,        34

You should be able to 'copy & paste' this raw data listing into a simple text editor and save the data file on your machine. Most GIS systems can then import this dataset as a layer. You may have to omit the commented lines (#) if your GIS has trouble importing the data.