title: Automated download of NetCDF file
body: <p>Just wondered if anyone could help I'm trying to download a NetCDF file from the internet within my code. The website is wish to download from is:</p>
  
  <p><a href="http://www.esrl.noaa.gov/psd/cgi-bin/db_search/DBListFiles.pl?did=3&amp;tid=38354&amp;vid=20" rel="nofollow">http://www.esrl.noaa.gov/psd/cgi-bin/db_search/DBListFiles.pl?did=3&amp;tid=38354&amp;vid=20</a></p>
  
  <p>the file name which I would like to download is air.sig995.2013.nc</p>
  
  <p>and if its downloaded manually the link is:</p>
  
  <p><a href="ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/surface/air.sig995.2013.nc" rel="nofollow">ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/surface/air.sig995.2013.nc</a></p>
  
  <p>Thanks</p>