One could still look for station changes and start a new trend calculation at the date of the station change. (realclimatescience.com)
After an Excel analysis of the absolute and anomaly temperature dataset, which can be downloaded from the same web page that produced the above chart, that NOAA trend calculation can not be confirmed with any confidence. (c3headlines.com)
Thank you to Kevin Cowtan for the nice interactive temperature plotting and trend calculation tool. (realclimate.org)