Environmental Science
During the winter solstice in the Northern Hemisphere:

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

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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:

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

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