The mean North Poll winter temperature is -40F not -20F.
http://polardiscovery.whoi.edu/poles/weather.html
I didn’t provide a winter mean temperature for the North Pole, but the mean temperature for the region north of latitude N 80 degrees for that specific day.
You can check it for today right here.
http://wattsupwiththat.com/reference-pages/sea-ice-page/