Temperature above 80 degrees north drops below freezing early, and continues to drop.
Many people have been watching the remarkable early drop in air temperature at the DMI plot here:
This drop looks to be about two weeks early. As this next analysis of sea surface temperature shows, much of the area is below freezing. Of course in seawater, ice doesn’t form until temperatures get below 28.4°F (-2°C), so it is close, but not quite there yet. [Note: due to lower salinity in the Arctic seawater freezes at -1.8C according to this essay at NOAA by Peter Wadhams]
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