Prior to the post 1999 tampering, the GISS US temperature graph looked like this :
NASA GISS: Science Briefs: Whither U.S. Climate?
This exactly mirrors the graph of USHCN record highs.
http://cdiac.ornl.gov/ftp/ushcn_daily/us.txt.gz
The old versions of GISS were correct, before the data was altered. The 1930s were much hotter. People who rewrite history are criminals.
Real Science 
Yes, the alarmists have lied so much that their credibility is absolute zero.