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December Weather in South Jacksonville, United States

Last updated: June 24, 2025

In December, the average temperature in South Jacksonville, United States hovers around 2°C (37°F). Expect a wide range, with minimums dipping as low as -19°C (-2°F) and maximums reaching up to 21°C (70°F). Precipitation is moderate, with 48 mm (1.9 in) over approximately 7 days, while the average humidity remains high at 86%.

December Temperature in South Jacksonville

In December in South Jacksonville, the average temperature is 2°C (37°F). The maximum can reach 21°C (70°F), while the minimum can drop as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures, ensuring they dress in layers to stay comfortable during their visit.

December Weather in South Jacksonville: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South Jacksonville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Jacksonville, December typically has an average temperature of 2°C (37°F), with highs reaching up to 21°C (70°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec293244536675787571574236
Data source: Temperature data for South Jacksonville 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 South Jacksonville

In South Jacksonville in December, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.

December Precipitation Trends in South Jacksonville

The chart displays monthly precipitation patterns in South Jacksonville, 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 South Jacksonville, December typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec676413712315012310391641026648
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Jacksonville

In South Jacksonville in December, humidity is 86%. With an average temperature of 2°C (37°F), this humidity feels like a chilly dampness that clings to your clothes and makes outdoor activities quite uncomfortable for traveling.

December Average Humidity in South Jacksonville

This chart illustrates the average monthly humidity levels in South Jacksonville, 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 South Jacksonville is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in South Jacksonville

In South Jacksonville 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 South Jacksonville, you can check the information here.

Maximum UV Index Levels in South Jacksonville for December

The chart shows the monthly maximum UV Index (UVI) for South Jacksonville 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 South Jacksonville typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111199643
Data source: South Jacksonville 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 South Jacksonville Compares to Other Months

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

This table compares monthly weather conditions in South Jacksonville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)67 mm (2.6 inches)82%moderate
February Weather0°C (32°F)64 mm (2.5 inches)80%moderate
March Weather7°C (44°F)137 mm (5.4 inches)80%high
April Weather11°C (53°F)123 mm (4.8 inches)80%very high
May Weather19°C (66°F)150 mm (5.9 inches)82%very high
June Weather24°C (75°F)123 mm (4.9 inches)83%extreme
July Weather25°C (78°F)103 mm (4.0 inches)81%extreme
August Weather24°C (75°F)91 mm (3.6 inches)80%very high
September Weather22°C (71°F)64 mm (2.5 inches)76%very high
October Weather14°C (57°F)102 mm (4.0 inches)76%high
November Weather6°C (42°F)66 mm (2.6 inches)85%moderate
December Weather2°C (37°F)48 mm (1.9 inches)86%moderate

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