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

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

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

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

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