Satellite temperature data is only usable when it’s consistent.
UAH finds a warming error in satellite data, lowers “tropical hotspot” temperature trend, contradicts IPCC models
From the University of Alabama, Huntsville via email from Dr. John Christy. Weather Satellite Wanders Through Time, Space, Causing Stray Warming to Contaminate Data In the late 1990s, the NOAA-14 weather satellite went wandering through time and space, apparently changing the record of Earth’s climate as it went.