Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

The sun's energy is less intense in the Southern Hemisphere
The earth is farther from the sun in July
Over 80% of the Southern Hemisphere is covered with water
The earth is closer to the sun in January

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Environmental Science
The wind-chill factor:

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

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