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During your vacation in Puerto Rico you'll very likely enjoy balmy weather regardless of when you visit. During December, the temperature doesn't fluctuate much during the course of the day.
The daily high temperature averages degrees falling to degrees during the middle of the night.
This data indicates that during the first third of the month the daily low averages degrees and the high averages degrees. During the middle of the month the daily low is typically around degrees and the high is about degrees on average. Over the last part of December the low averages degrees and the high temperature averages degrees. To learn more about temperature fluctuations during December in Puerto Rico, review the above table.