We continue our investigation of the effect of disappearing stations and their effect upon the global surface trend. Here's a graph of global temperature we obtain when we consider only those weather stations that operated continuously for a period that includes, but is not limited to, the forty-year period 1960 to 2000. There are only 73 such stations, out of the eight thousand in the global data. The graph shows the number of these 73 available in each year, and compares the trend we obtain from these stations to the trend we obtain from all available stations.
Despite the dramatically reduced number of stations, the new trend is close to the old trend. But the drop in temperature from 1950 to 1970 is greater, so that the rise from 1970 to 2000 is no longer exceptional.