Data are obtained from the Danish meteorological institute (DMI). The data are downloaded from the climatological download service for bulk data from 2011 onwards for Denmark and for 2014 onwards for Greenland.

Daily maximum, minimum and mean temperatures before 2011 are reconstructed from DMI's raw hourly and 3-hourly observations (available from 1953). They are not quality controlled by DMI and can differ by a few tenths of a degree from official values. Read how the data were reconstructed.

Surface analysis from the Met Office (UKMO).