NOAA/NCDC has long been associated with fabricated global warming ..... in a way, they must aspire to be identified as the epitome of manipulative, anti-science methodologies.
From time to time, NOAA also exhibits the typical your-federal-govt-at-work "competence".
On their 'Climate-At-A-Glance' (CAG) web site, NOAA reports that the contiguous U.S. has been cooling at a rate of -0.6°F per century since January 1, 1994 (see pink rectangle on image). That's a 258-month period.
Surprise! Color me a skeptic.
Per the monthly absolute temperatures and anomalies that NOAA reports for the period from Jan 1994 to June 2015, there does not appear to be any obvious means to calculate a cooling trend. In fact, using the CAG supplied NOAA dataset for temperatures during that period, there is a warming trend of 1.68°F, calculated using Excel's slope function for a linear trend.
Indeed, from the same NOAA reported data, there is a U.S. cooling trend but it does not start until February 1996. Using either NOAA's reported 'Climate-At-A-Glance' absolutes or anomalies, that trend is a -2.28°F for the 19.4 year period (233 months).
The more recent reporting from NOAA is hardly an improvement - from 2010 thru June 2015 they are reporting a -44.33°F per century cooling trend. Ummm...I don't think so.
It's highly doubtful that NOAA will be on the airwaves anytime soon discussing a -44 degree cooling trend when they're required to scream "it's-the-hottest-ever" constantly.
Summary: "Ashville, we have a problem." Okay, is this a function of just a very poorly designed web page that simply misleads the public? Or, a reporting system with really bad quality control efforts? Or competence, maybe lack thereof? Or, a management team totally distracted by their political agenda priorities prior to Paris 2015? Or, yet another successful Chinese hack penetrating government "security"?