When you use measurements obtained exclusively in heat-island city centers and compare them with past results taken in less developed and more rural (colder) locations, the results are going to appear to confirm “warming” when in fact, what they confirm is a purposeful change in result due to methodological manipulation.
When you use measurements obtained exclusively by thousands of sophisticated weather buoys, stations and satellites, assisted by powerful, number crunching supercomputers, none which existed a generation ago, and then you compare that data with data based upon infrequent and sometimes anecdotal human observations, then you are bound to obtain results that say anything you want them to say.