NOAA corrects the temperatures to get the trends that back up their CO2 caused global warming silliness.
This NOAA graph shows that the liars adjust temperatures DOWN in the 1930's to show the temperatures were COOLER than what the actual temperature measurements showed. They do this with the result that ADJUSTED temperatures trend with CO2 concentration changes!
YOUTUBE Coldest October-April In The US In Over A Century
If you are a betting person, wait for the NOAA liars to adjust the 2018-2019 record LOW temperatures to show the northern hemisphere really wasn't as cold as the press reported.
The US gubermint thinks people are stupid enough to believe their lies. Sadly, about 1/2 do believe most everything they are told.