Here’s a nice pic:
Its from http://surfacetemperatures.blogspot.co.uk/2014/06/global-land-surface-databank-version.html (but I cut it a bit to make it prettier). The colour bar is number of years.
Refs
* Understanding the effects of changes in the temperature scale standards through time
wmconnolley: scienceblogs.com/stoat archive 
Isn’t the greater Alpine region pretty? Lots of black dots with more than 200 years of data. They put a lot of effort in data rescue.
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Ya victor,
it looks like they have about 2K stations that we dont have..
Should be fun to use them as out of sample test
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