Environmental Science
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Higher water temperature in the Gulf of Mexico
Higher air temperature in the Gulf States
Low relative humidity of the air over the Pacific Ocean
Lower air temperature in Southern California

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Environmental Science
Frost forms when:

The dew point is 32oF or below.
Water vapor changes into ice without first becoming a liquid.
All of these
Objects on the ground cool below the dew point temperature.

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