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

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Data Listing

# 2020-09-20 High Temperature
# Download From: https://mesonet.agron.iastate.edu/GIS/apps/coop/plot.phtml
# Download Date: 20 Sep 2020
# Data Contact: Daryl Herzmann akrherz@iastate.edu 515.294.5978
#-----------------------snip------------------
ID    , StationName         , County              , Date      ,   Latitude,  Longitude,       high
SPRI4 , SPIRIT LAKE         , Dickinson           , 2020-09-20,    43.4231,   -95.1000,         78
SACI4 , SAC CITY            , Sac                 , 2020-09-20,    42.4239,   -94.9908,         75
SIBI4 , Sibley              , Osceola             , 2020-09-20,    43.4047,   -95.7483,         75
LSXI4 , LITTLE SIOUX 2 NW   , Harrison            , 2020-09-20,    41.8167,   -96.0167,         75
MPTI4 , MAPLETON NO. 2      , Monona              , 2020-09-20,    42.1667,   -95.7833,         74
SXGI4 , SIOUX CITY AIRPORT  , Woodbury            , 2020-09-20,    42.3964,   -96.3778,         74
CINI4 , CARROLL             , Carroll             , 2020-09-20,    42.0667,   -94.8500,         73
LOGI4 , LOGAN               , Harrison            , 2020-09-20,    41.6333,   -95.8167,         73
DNNI4 , DONNELLSON          , Lee                 , 2020-09-20,    40.6333,   -91.5667,         72
GTHI4 , GUTHRIE CENTER      , Guthrie             , 2020-09-20,    41.6833,   -94.5000,         72
OAKI4 , OAKLAND             , Pottawattamie       , 2020-09-20,    41.3133,   -95.3906,         72
SDHI4 , SHENANDOAH          , Page                , 2020-09-20,    40.7833,   -95.3500,         72
POCI4 , POCAHONTAS          , Pocahontas          , 2020-09-20,    42.7292,   -94.6606,         72
ATLI4 , ATLANTIC 1 NE       , Cass                , 2020-09-20,    41.4181,   -95.0031,         71
ALGI4 , ALGONA 3 W          , Kossuth             , 2020-09-20,    43.0667,   -94.3061,         71
CLDI4 , CLARINDA            , Page                , 2020-09-20,    40.7333,   -95.0333,         71
ROKI4 , RED OAK             , Montgomery          , 2020-09-20,    41.0000,   -95.2333,         71
RKWI4 , ROCKWELL CITY       , Calhoun             , 2020-09-20,    42.4000,   -94.6167,         71
BNWI4 , BOONE               , Boone               , 2020-09-20,    42.0500,   -93.9333,         70
AUDI4 , Audubon             , Audubon             , 2020-09-20,    41.7167,   -94.9333,         70
JFFI4 , JEFFERSON 2 NW      , Greene              , 2020-09-20,    42.0144,   -94.3797,         70
SWEI4 , SWEA CITY 4 W       , Kossuth             , 2020-09-20,    43.3853,   -94.2500,         70
DAKI4 , DAKOTA CITY         , Humboldt            , 2020-09-20,    42.7200,   -94.1800,         70
MSHI4 , MARSHALLTOWN        , Marshall            , 2020-09-20,    42.0667,   -92.9333,         69
BLLI4 , BELLE PLAINE        , Benton              , 2020-09-20,    41.9000,   -92.2667,         69
MSTI4 , MUSCATINE 2 N       , Muscatine           , 2020-09-20,    41.4708,   -91.0428,         69
DMX   , Des Moines WFO      , Polk                , 2020-09-20,    41.7361,   -93.7233,         69
TLDI4 , TOLEDO 3 N          , Tama                , 2020-09-20,    41.9833,   -92.5833,         69
OSEI4 , OSCEOLA             , Clarke              , 2020-09-20,    41.0167,   -93.8167,         69
CRNI4 , Corning             , Adams               , 2020-09-20,    40.9886,   -94.7491,         69
MKTI4 , MAQUOKETA 4 W       , Jackson             , 2020-09-20,    42.0667,   -90.7000,         69
ASNI4 , ALLISON             , Butler              , 2020-09-20,    42.7500,   -92.7833,         68
EKRI4 , ELKADER 6SSW        , Clayton             , 2020-09-20,    42.7754,   -91.4537,         68
DLDI4 , Dubuque L&D 11      , Dubuque             , 2020-09-20,    42.5167,   -90.6500,         68
BCNI4 , BEACONSFIELD        , Ringgold            , 2020-09-20,    40.8236,   -94.0439,         68
ICYI4 , IOWA CITY           , Johnson             , 2020-09-20,    41.6489,   -91.5328,         68
HPTI4 , HAMPTON             , Franklin            , 2020-09-20,    42.7500,   -93.2000,         68
CNTI4 , CENTERVILLE         , Appanoose           , 2020-09-20,    40.7375,   -92.8703,         68
WSHI4 , WASHINGTON          , Washington          , 2020-09-20,    41.2833,   -91.6833,         68
NWTI4 , NEWTON              , Jasper              , 2020-09-20,    41.7000,   -93.0500,         68
WMTI4 , FORT DODGE 5 NNW    , Webster             , 2020-09-20,    42.5061,   -94.2011,         68
AESI4 , AMES 5 SE           , Story               , 2020-09-20,    41.9625,   -93.5611,         68
KNXI4 , KNOXVILLE           , Marion              , 2020-09-20,    41.3167,   -93.1333,         68
IWAI4 , IOWA FALLS          , Hardin              , 2020-09-20,    42.5333,   -93.2667,         68
GNDI4 , GRUNDY CENTER       , Grundy              , 2020-09-20,    42.3553,   -92.7739,         68
EOKI4 , Keokuk L&D 19       , Lee                 , 2020-09-20,    40.4000,   -91.3667,         68
FRFI4 , FAIRFIELD           , Jefferson           , 2020-09-20,    41.0333,   -91.9500,         67
BLVI4 , Bellevue LD 12      , Jackson             , 2020-09-20,    42.2667,   -90.4167,         67
CHRI4 , CHARITON 1 E        , Lucas               , 2020-09-20,    41.0000,   -93.3167,         67
MTAI4 , MOUNT AYR           , Ringgold            , 2020-09-20,    40.6828,   -94.2944,         67
RADI4 , RATHBUN DAM         , Appanoose           , 2020-09-20,    40.8200,   -92.8800,         67
GTTI4 , GUTTENBERG L & D 10 , Clayton             , 2020-09-20,    42.7858,   -91.0997,         67
SNYI4 , STANLEY 4 W         , Buchanan            , 2020-09-20,    42.6431,   -91.8108,         67
AMOI4 , Anamosa 3SSW        , Jones               , 2020-09-20,    42.0763,   -91.3019,         67
TRPI4 , TRIPOLI             , Bremer              , 2020-09-20,    42.8131,   -92.2583,         67
ALBI4 , ALBIA 3 NNE         , Monroe              , 2020-09-20,    41.0667,   -92.7833,         66
COJI4 , COLUMBUS JUNCT 2 SSW, Louisa              , 2020-09-20,    41.2500,   -91.3700,         66
ALRI4 , ALLERTON            , Wayne               , 2020-09-20,    40.7067,   -93.3650,         66
VNTI4 , VINTON              , Benton              , 2020-09-20,    42.1667,   -92.0000,         64

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.