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Re:IBM to Acquire the Weather Company by dublinben on Wednesday October 28, 2015 @01:05PM (#10465756)
The National Weather Service makes historical weather data available for free in a standardized format.[0] I'm sure there's already a parser written for any language you might be using.

[0]http://w2.weather.gov/climate/index.php?wfo=mtr

Re:IBM to Acquire the Weather Company by lelandbatey on Wednesday October 28, 2015 @03:43PM (#10466823)
That's true, but that data is for only a few locations.