Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Release of latent heat to the atmosphere when polar ice melts
The insulating properties of snow
Concentration of earth's magnetic field lines at the poles
Conduction of heat through the interior of the earth
Circulation of heat by the atmosphere and oceans

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Environmental Science
During the winter solstice in the Northern Hemisphere:

At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
The noon sun is overhead at 23.5o S latitude
Astronomical winter begins in the Northern Hemisphere
All of these

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