NCDC continues to break all records for data tampering in 2014, with a hockey stick of adjustments to turn a long term cooling trend into a warming trend.
Note that the adjustments above do not include the adjustments NCDC makes when they go from raw daily to raw monthly. Those further increase the magnitude of the tampering.
They are not making any additional TOBS adjustments after 2005, so most of the recent data tampering appears to be due to infilling missing data. Nearly 50% of the temperature data used by NCDC is now imaginary.
When your rules allow you to make up half the data, you can generate any trend your funders require.