I wonder if the heat from the tarmac as well as heat from all the jet engines in addition to increased air traffic in general at DEN has made the temperature observations hotter than they would normally be? Or, is it just that the area where DEN is located is just warmer than the old Stapleton location? I know that DEN is located further to the east of Stapleton out on the edge of the suburbs, or at least that was the case when I visited Denver back in 2006.