I am interested in finding the summer average (either climatalogical mean or for a specific year) relative humidity and temperature for a set of globally distributed latitude and longitude coordinates.
What I need are mean values for June, July, and August.
I would prefer to use actual observed values, but a reanalysis (such as NARR or CRU-NCEP would suffice). Is there a web-based interface from which I can obtain this information?
The closest that I have come to this
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Wolfram Alpha, but they only provide rainfall and temperature, not relative humidity
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worldclim.org looks promising, but requires me to download all of the data before using another program to extract information; it also does not have relative humidity.
Best Answer
http://www.wunderground.com/about/pr/news.asp?date=19990412
Use the API to access this data
Historical Request Example (San Fransisco Airport) on 18th October 2010.
http://api.wunderground.com/api/YOUR_API_KEY/history_20101018/q/SFO.json
truncated for GIS Stack Exchange.
http://www.wunderground.com/weather/api/ (can be setup in 5 minutes)
For Lat/Lngs you need to add the GeoLookUp request: