An Inspection of NOAA’s Global Historical Climatology NetWork Verson 3 Unadjusted Data
NOAA's data comes from measuring stations with differing lengths of existence and the trends in the raw data show much less warming than commonly reported by NOAA and the IPCC as a result of adjustments.
A former scientist at the National Oceanic and Atmospheric Administration (NOAA) examines the raw data records from NOAA's National Centers for Environmental Information, its network of temperature measuring stations around the world. The author examined the raw temperature data from 7280 stations worldwide, many with differing lengths of existence, paying careful attention to a number of factors: 1. The differing "temperature trends of Rural, Suburban, and Urban Station locations ... as well as whether or not those locations are at Airports affects the trends;" and 2. The affect the differing lengths of existence may have played in temperature trends.:
The author concluded: "The rate of temperature trends for larger Extents appears to be much less than that which NCEI, NOAA and the IPCC reports based on the entire set of 7280 GHNC Stations." As a result, the newer stations may be biasing the results in favor of greater warming reported.