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The site www.wunderground.com stores historical weather records from weather stations all over the world, an example of which can be seen here (scroll down to the bottom of the page to see the Hourly Observations table): http://www.wunderground.com/history/airport/EGKK/2001/2/11/DailyHistory.html?req_city=NA&req_state=NA&req_statename=NA&MR=1
That page is reached by entering city, weather station, or longitude/latitude co-ordinates into the form on this page http://www.wunderground.com/history . At present, we have a list of weather stations (eg airport/EGKK in the link above) for which we would like weather, so the tool needs to be able to use those. However, if possible in we would also be able to give it co-ordinates and have it find historical weather from the nearest available weather station.
We want a function where we can input weather station or co-ordinates, which then scrapes the weather information from the wunderground .com historic hourly observations tables, as seen in the sample output table attached. We only need the observation that is nearest (either before or after) the time inputted into the function.
I have also attached a few example weather stations to give you a starting point, though it needs to work for any active weather station on wunderground.com