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December Weather in Louisiana, United States

Last updated: June 24, 2025

In Louisiana, United States, the average temperature in December hovers around 3°C (37°F). During this time, you can expect minimum temperatures to dip as low as -19°C (-1°F), while the maximum can reach a comfortable 23°C (73°F). With an average rainfall of 48 mm (1.9 in) spread over 6 days, the month also boasts a high humidity level of 86%, creating a distinctly chilly atmosphere.

December Temperature in Louisiana

In December in Louisiana, the average temperature is 3°C (37°F), with maximums reaching 23°C (73°F) and minimums dropping as low as -19°C (-1°F). Travelers should be prepared for a wide range of temperatures, from mild days to potentially frigid nights.

December Weather in Louisiana: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Louisiana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Louisiana, December typically has an average temperature of 3°C (37°F), with highs reaching up to 23°C (73°F) and lows dropping to around -19°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec303345536675797571574337
Data source: Temperature data for Louisiana 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 Louisiana

In Louisiana in December, the precipitation amount is 48 mm (1.9 in) distributed over 6 days.

December Precipitation Trends in Louisiana

The chart displays monthly precipitation patterns in Louisiana, 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 Louisiana, December typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec6763133115168115111112761036548
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Louisiana

In Louisiana in December humidity is 86%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable.

December Average Humidity in Louisiana

This chart illustrates the average monthly humidity levels in Louisiana, 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 Louisiana 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 Louisiana

In Louisiana 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 Louisiana, you can check the information here.

Maximum UV Index Levels in Louisiana for December

The chart shows the monthly maximum UV Index (UVI) for Louisiana 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 Louisiana typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Louisiana 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 Louisiana Compares to Other Months

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

This table compares monthly weather conditions in Louisiana, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)67 mm (2.6 inches)82%moderate
February Weather0°C (33°F)63 mm (2.5 inches)80%moderate
March Weather7°C (45°F)133 mm (5.2 inches)80%high
April Weather12°C (54°F)115 mm (4.5 inches)80%very high
May Weather19°C (66°F)168 mm (6.6 inches)82%very high
June Weather24°C (76°F)115 mm (4.5 inches)83%extreme
July Weather26°C (79°F)111 mm (4.4 inches)81%extreme
August Weather24°C (75°F)112 mm (4.4 inches)80%very high
September Weather22°C (71°F)76 mm (3.0 inches)76%very high
October Weather14°C (58°F)103 mm (4.0 inches)76%high
November Weather6°C (43°F)65 mm (2.6 inches)85%moderate
December Weather3°C (37°F)48 mm (1.9 inches)86%moderate

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