I used to have a site bookmarked that showed historic weather data for lots of UK and world weather stations. It wasn't tutiempo, although that has a lot of data it is often rounded.

 

This had Tmin, Tmax, and rainfall. I remember the temperature panels were colour coded, eg the highest temperatures showed on a red background, cooler ones were in orange, then green, and cold ones in blue.

 

Does this ring a bell with anyone?

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I'm not sure Rob. Could it be this one?

http://www.ogimet.com/gsynres.phtml.en 

You will need the WMO code for the locations but it gives a good detailed comprehensive overview, for example:

http://www.ogimet.com/cgi-bin/gsynres?lang=en&ind=03091&ndays=30&ano=2013&mes=12&day=23&hora=06&ord=REV&Send=Send 

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">http://www.ogimet.com/cgi-bin/gsynres?lang=en&ind=03091&ndays=30&ano=2013&mes=12&day=23&hora=06&ord=REV&Send=Send