Read here. Other than the typical lamebrain MSM reporters (scroll down to Arctic temps "reported" by George Monbiot), just about everyone else knows that NASA completely fabricates modern hot Arctic temperatures from wishful alarmist thinking.
NASA's blatantly, bogus temperatures (lies?) are an attempt to scare the public into thinking the ice sheets of Greenland are quickly melting away because of unprecedented "high" temperatures, including those maximum high temperatures forecasted for the ice sheet this week: an average of a -35°F (yes, minus) for the daily high temps. Obviously, the northern ice sheets are safe despite the bogus NASA and Monbiot Arctic alarmism.
While NASA's computer jocks spend their time and our money on fabricating fake temperatures, real scientists continue to conduct expert scientific research on the Arctic. Their latest peer-reviewed findings confirm a previous study that the Medieval Period experienced Arctic temperatures some 2-3°C higher than modern Arctic temps. Map source here.
"We have generated a ~5,000 year long, decadally-resolved record of summer water temperature from the annually-laminated sediments of Lower Murray Lake on Ellesmere Island in the Canadian High Arctic. The varved sediments of Lower Murray Lake allowed high-resolution sampling and excellent chronologic control of the sedimentary record.....Most strikingly, the alkenone record reveals warm lake water temperatures beginning ~800 AD and persisting until ~1200 AD, with temperatures up to 2-3 deg C warmer than the mean temperature for the past 100 years. This dramatic medieval warm period on Ellesmere Island interrupted a distinct (neoglacial) cooling trend that had begun approximately 2000 years earlier." [D'Andrea, W. J.; Bradley, R. S. 2010]
Read about other peer-reviewed studies. Additional climate history postings and historical temperature charts. Fabrication-temperature charts here.