NCDC engages in all kinds of climate fraud, but none worse than their Climate Extremes Index.
percentage of the United States with maximum temperatures much above normal
Compare this vs. the actual NCDC thermometer data, which shows that the percentage of the US with abnormally hot summer temperatures used to be much larger. I chose 40C as my reference, because it normalizes somewhat with the recent CEI years.
The CEI is 100% fraudulent, and important to note that this data is not subject to TOBS or homogenization. There is no way for them to explain this away with their standard excuses.