Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The water droplets in the clouds reflect infrared energy back to earth
The clouds start convection currents between them
The formation of the clouds releases latent heat energy
The clouds are better conductors of heat than is the clear night air
The clouds absorb and radiate infrared energy back to earth

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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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