NOAA claims that their adjustments are small, peer reviewed and well documented. A total of about 0.5F, and then they go flat after 1990.
This is bad enough, but the actual adjustments (below) are much larger than what they document – about three times larger. Note too the oddity with 2012. They had to adjust 2012 raw data down, because their 2012 “raw” data was adjusted upwards by a huge amount.
Even worse is that the adjustments now increase exponentially after 1990, whereas their documentation shows that they go flat after 1990.
The graph below superimposes the documented “peer reviewed” adjustments on the actual adjustments which NOAA is publishing. As you can see, they bear little resemblance.
NOAA hides behind peer review, when in fact they aren’t even using the adjustments which they had reviewed. The published NOAA US temperatures bear no resemblance to reality. Bottom line is that NOAA is either completely incompetent or committing fraud – or both.