We used the data from these station to cross-infill all of them. Two of them started before 1820 and eight others started in the 19th century. The method examined each pair of stations separately for each calendar month, calculated the correlation between them, then infilled missing data using whichever station had the best correlation and which had not itself been infilled.
As examples of the infilling we give below sample charts for 5 stations near to the peninsula: Salehard, MYS Kamennyj, Berezovo, Hoseda-Hard and Ostrov-Dikson. The most interesting chart we present is the last which is the estimated temperature for the Yamal peninsula based in the weighted average temperature of 6 stations in or near to the peninsula. This shows that the temperature has risen at about 0.56 °C per century but there is no sign of a sharp, 'hockey-stick' like upturn.