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December Weather in Mystic Island, United States

Last updated: June 24, 2025

In December, the average temperature in Mystic Island, United States hovers around 5°C (42°F). Expect a minimum chill of -11°C (13°F) and a pleasant maximum of 19°C (66°F). This month brings 106 mm (4.2 in) of precipitation spread over 9 days, accompanied by an average humidity of 81%.

December Temperature in Mystic Island

In December in Mystic Island, the average temperature is 5°C (42°F). The maximum can reach 19°C (66°F), while the minimum can drop as low as -11°C (13°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in Mystic Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Mystic Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mystic Island, December typically has an average temperature of 5°C (42°F), with highs reaching up to 19°C (66°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec374045546373797772634942
Data source: Temperature data for Mystic Island generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Mystic Island

In Mystic Island in December, the total precipitation amount is 106 mm (4.2 in), spread over the course of 9 days.

December Precipitation Trends in Mystic Island

The chart displays monthly precipitation patterns in Mystic Island, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Mystic Island, December typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec65102109981099012513211213680106
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mystic Island

In Mystic Island in December, humidity is 81%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures feel more daunting and travel less invigorating.

December Average Humidity in Mystic Island

This chart illustrates the average monthly humidity levels in Mystic Island, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Mystic Island is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%81%79%74%77%76%77%74%75%80%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mystic Island

In Mystic Island in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Mystic Island, you can check the information here.

Maximum UV Index Levels in Mystic Island for December

The chart shows the monthly maximum UV Index (UVI) for Mystic Island in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Mystic Island typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568101010108743
Data source: Mystic Island December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Mystic Island Compares to Other Months

Weather in Mystic Island varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mystic Island, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Mystic Island, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)65 mm (2.5 inches)83%moderate
February Weather5°C (41°F)102 mm (4.0 inches)82%moderate
March Weather7°C (45°F)109 mm (4.3 inches)81%high
April Weather12°C (54°F)98 mm (3.9 inches)79%very high
May Weather17°C (63°F)109 mm (4.3 inches)74%very high
June Weather23°C (73°F)90 mm (3.5 inches)77%very high
July Weather26°C (79°F)125 mm (4.9 inches)76%very high
August Weather25°C (77°F)132 mm (5.2 inches)77%very high
September Weather22°C (72°F)112 mm (4.4 inches)74%very high
October Weather17°C (63°F)136 mm (5.4 inches)75%high
November Weather9°C (49°F)80 mm (3.1 inches)80%moderate
December Weather5°C (42°F)106 mm (4.2 inches)81%moderate

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