NCDC and NASA complain that the US temperature record is problematic, but this is complete BS. I tried splitting the 1200 HCN stations into two nearly evenly sized groups, those whose station number ends in 0-4 and those whose station number ends in 5-9. There is no overlap in the groups and group placement is for all intents and purposes random.
As you can see, they produce almost identical trends, indicating that the US surface temperature record is excellent, and adjustments are unnecessary and unwanted. Trying to adjust individual stations is scientific madness.