Again and again, data analyst Tony Heller has caught government agencies doctoring temperature data records to make the past seem colder (and the present, therefore, warmer in comparison).
Now Heller has noticed the official NOAA data set for Boulder, Colorado. In one case, the government agency has lowered past temperatures AS MUCH AS 7.8 DEGREES! See here.
NOAA lowered the average temperature for December 1957 by 7.8F, and made the average temperature minimum nearly as cold as the lowest temperature for the month.
“Almost every day of the month was above the adjusted average.”