NCDC is using the US temperature graph below, to influence government policy.
They document that they do 0.5F tampering to the data, and that their tampering goes flat after 1990.
But they actually do 1.5F tampering, and it increases exponentially after 1990.
The graph below overlays the actual tampering, on top of the documented adjustments. USHCN tampering is almost 300% of their documented adjustments.
The whole NCDC US temperature record is a complete fraud. The thermometer data shows no temperature increase since 1900.
NOAA, NASA and CRU all acknowledged this, before they started cheating after the year 2000.
Phil Jones and NOAA said there was no warming in the US.
February 04, 1989 Last week, scientists from the United States Commerce Department’s National Oceanic and Atmospheric Administration said that a study of temperature readings for the contiguous 48 states over the last century showed there had been no significant change in average temperature over that period. Dr. (Phil) Jones said in a telephone interview today that his own results for the 48 states agreed with those findings.
In 1999, Hansen said that he didn’t see anything happening in the US.
Empirical evidence does not lend much support to the notion that climate is headed precipitately toward more extreme heat and drought. The drought of 1999 covered a smaller area than the 1988 drought, when the Mississippi almost dried up. And 1988 was a temporary inconvenience as compared with repeated droughts during the 1930s “Dust Bowl” that caused an exodus from the prairies, as chronicled in Steinbeck’s Grapes of Wrath…..
in the U.S. there has been little temperature change in the past 50 years, the time of rapidly increasing greenhouse gases — in fact, there was a slight cooling throughout much of the country