The correct statement about the average temperatures is that it is lower in San Diego because of the cool ocean currents from the north.
What is average temperature?
The average temperature of the air for a certain time period, usually a day, a month, or a year, as measured by a properly exposed thermometer.
In the picture it is clear that current coming from the ocean of the north side make the average temperature of the San Diego lower as compared to the Savannah as they experience more ocean currents than Savannah.
Hence, correct statement is, it is lower in San Diego because of the cool ocean currents from the north.
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