Environmental Science
During the winter solstice in the Northern Hemisphere:

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

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Environmental Science
The wind-chill factor:

Relates body heat loss with wind to an equivalent temperature with no wind
Determines how low the air temperature will be on any given day
Tells farmers when to protect crops from a freeze
Indicates the temperature at which water freezes on exposed skin
Takes into account humidity and air temperature in expressing the current air temperature

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