Since 1989, the number of US daily temperature readings has plummeted back to the level of 100 years ago.
NCDC has taken full advantage of this, by creating a massive warming bias through manufacturing fake missing station data. The graph below shows the steps of data tampering, all introducing a warming bias. Fabricated data is defined as USHCN final monthly station data marked with “E” – meaning there is missing thermometer data from that station.
- Drop colder HCN stations to warm the present 0.1ºF. Raw Daily -> Raw Monthly
- Cool the past 0.5ºF. through TOBS . Raw monthly -> Non-Fabricated
- Warm the present through making up fake data. Non-Fabricated-> Fabricated
This is a very important discovery, because most of the data tampering since 1990 is due to manufacturing fake data rather than adjusting actual thermometer data.