Furthermore, it is also important to note that the methods used in global temperature analyses make them robust to the loss of stations because they use techniques which incorporate multiple nearby stations into analysis of any individual region. (skepticalscience.com)
«The National Oceanic and Atmospheric Administration (NOAA) in the US has released its global temperature analysis for 2013. (ramblingsdc.net)
The reason this assumption is made is because during the 1990s there was a large reduction in the number of meteorological stations being used for global temperature analyses. (skepticalscience.com)