This comes following president-elect Donald Trump’s campaign promise to impose import tariffs on EU exports to the US.
This marks the third consecutive increase, following a 4.8% increase on 5 November.
There were reductions in price for butter, cheese and whole milk powder in the European spot markets this week, writes Aidan Brennan.
The incoming US health secretary is known for his alternative views including hostility to processed foods.
The price of butter has broken the previous record set just two months ago, writes Aidan Brennan.
A 1.9% increase at the second and final GDt event for November brings the price index to its highest value in 28 months.
Kerrygold was one of the few butters in our tests that spread well when cold, without crumbling or lumping too stubbornly on the bread, the New York Times has said.
However, the index rise marks the second successive increase after there was a 4.8% increase on 5 November.
The price rises follow on from similar measures take by Dairygold, Kerry Dairy Ireland and Lakeland Dairies Ireland in recent weeks.