Binntho, nice observations.
I will make a couple of reflections:
1) In the absence of noteworthy pressure systems in the Arctic (both H & L), katabatic winds will tend to dominate on the north slopes of both Alaska and Greenland. None of these will be picked up by ECMWF, and thus not influence the DMI80N temperature indicator.
2) In the NH mid-latitudes, we have also had a dominant absence of L- & H-pressure systems during June this year, which has resulted in an unprecedented period of vertical energy exchange (i.e. dewfall during night and drizzle during day).
3) Linking these two anomalies, we have observed a dominance of strong and bright nocti-lucent clouds throughout the past month. How, these phenomena may be linked to the current warmth observed by Null-School over the Arctic ice-surface, remains to be seen.