I am working on a data mining project and I would like to gather historical weather data. I am able to get historical data through the web interface that they provide at http://www.ncdc.noaa.gov/cdo-web/search. But I would like to access this data programmatically through an API. From what I have been reading on StackOverflow this data is supposed to be public domain, but the only place I have been able to find it is on non-free services like Wunderground. How can I access this data for free?
For a list of all service APIs provided by the National Climatic Data Center: http://www.ncdc.noaa.gov/cdo-web/webservices
Full documentation to the API which backs the search page you listed: http://www.ncdc.noaa.gov/cdo-web/webservices/v2
Requires a token, and limits to 1000 requests per day. If you need the limit increased for legitimate reasons contact http://www.ncdc.noaa.gov/customer-support.
Also, for bulk downloading use ftp: ftp://ftp.ncdc.noaa.gov/pub/data/
来源：https://stackoverflow.com/questions/19978707/historical-weather-data-from-noaa