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   Automated Surface Observing System (ASOS) | National Centers for Environmental Information (NCEI) formerly known as National Climatic Data Center (NCDC)
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There are currently more than 900 ASOS sites in the United States. These systems generally report at hourly intervals, but also report special observations if weather conditions change rapidly and cross aviation operation thresholds.<p>ASOS serves as a primary climatological observing network in the United States. Not every ASOS is located at an airport; for example, one of these units is located at Central Park in New York City. ASOS data are archived in the Global Surface Hourly database, with data from as early as 1901.<ul><li><a href=ftp://ftp.ncdc.noaa.gov/pub/data/asos-onemin/ rel=nofollow> 1-Minute ASOS Data </a> <br> These data are only available for ASOS stations. <span>   </span> <span> </span><li><a href=ftp://ftp.ncdc.noaa.gov/pub/data/asos-fivemin/ rel=nofollow> 5-Minute ASOS Data </a> <br> These data are only available for ASOS stations. <span> </span><li><a href=http://www7.ncdc.noaa.gov/CDO/cdopoemain.cmd?datasetabbv=DS3505&countryabbv=&georegionabbv=&resolution=40 rel=nofollow> User Interface Page </a> <br> After agreeing to the regulations regarding data usage, you will be directed to select a Simplified or Advanced Option to obtain the data. Not recommended for large volumes of data.<li><a href=ftp://ftp.ncdc.noaa.gov/pub/data/noaa/ rel=nofollow> Direct FTP Access </a> <br> Data by year; highly recommended for large volumes of data.</ul></div></div></div></div></div></div></div></div></div><div class=col-2-left><div class=leftNavLink><a id=sidebar-links> </a><div class="region region-sidebar-first"><div class="block block-menu-block"id=block-menu-block-3><div class=content><div class="menu-block-wrapper menu-block-3 menu-name-main-menu parent-mlid-0 menu-level-2"><ul class=menu><li class="first leaf menu-mlid-1535 dhtml-menu"id=dhtml_menu-1535><a href=/data-access/quick-links> Quick Links </a><li class="expanded active-trail menu-mlid-582 dhtml-menu"id=dhtml_menu-582><a class=active-trail href=/data-access/land-based-station-data> Land-Based Station </a> <ul class=menu><li class="first expanded active-trail menu-mlid-1490 dhtml-menu"id=dhtml_menu-1490><a class=active-trail 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