In the year 2000, our goobermint said
the hottest year for the 48 contiguous states
was in the 1930s.
That fact did not support the coming global warming catastrophe boogeyman.
By 2009 frequent continuous small "adjustments" had moved the hottest year from the 1930s to the 1990s!
The people who control the historical data can make it say anything they want it to say!
Watch the record temperature peak change as the chart morphs from the 2000 version of US climate history, to the 2009 version of history.