Wood for Trees maintains copies of all the major climate data from satellite systems and surface records. NASA, Hadcrut, UHI, they are all there. It takes a bit of tinkering to figure out how to use the interface but once you do, you can graph and compare the data any way you like. If you want to compare January temperature trends in the northern hemisphere as recorded by NASA to July temperatures as recorded by Hadcrut (no idea why you would do that, its just an example) for the last 100 years, you can
Yamal Larch. How just one tree got to be 50% of the climate data
Hide the decline; An email by email analysis
Earth gains heat at the equator and loses it at the poles
CO2 is increasing out of control! Or not.
Is someone quoting climate warming arguments off their iPhone app?
So is the Arctic ice cap melting or isn’t it?
What about the Antarctic? Is it Melting?
CO2 rising… Temperature levelling off…