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December Weather in Slidell, United States

Last updated: June 24, 2025

In December, the average temperature in Slidell, United States hovers around 14°C (57°F). Expect minimums to dip to 2°C (36°F) and highs reaching 25°C (77°F). During this month, you can anticipate approximately 103 mm (4.1 in) of precipitation spread over 11 days, with an average humidity of 87%. Stay prepared for a mix of weather!

December Temperature in Slidell

In December in Slidell, the average temperature is 14°C (57°F). Maximums can reach 25°C (77°F), and minimums can be as low as 2°C (36°F). This makes Slidell an ideal destination for travelers looking to enjoy mild weather and comfortable conditions.

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

The chart illustrates December temperature patterns in Slidell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Slidell, December typically has an average temperature of 14°C (57°F), with highs reaching up to 25°C (77°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec545964697781838380746157
Data source: Temperature data for Slidell 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 Slidell

In Slidell in December, the precipitation amount is 103 mm (4.1 in) spread over 11 days.

December Precipitation Trends in Slidell

The chart displays monthly precipitation patterns in Slidell, 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 Slidell, December typically receives around 103 mm (4.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec981078012614022318922413012760103
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Slidell

In Slidell in December humidity is 87%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making every breath feel heavy and sticky, which can be quite challenging for travelers exploring the city.

December Average Humidity in Slidell

This chart illustrates the average monthly humidity levels in Slidell, 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 Slidell is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%78%73%71%79%78%80%76%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Slidell

In Slidell in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Slidell for better planning.

Maximum UV Index Levels in Slidell for December

The chart shows the monthly maximum UV Index (UVI) for Slidell 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 Slidell typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121110864
Data source: Slidell 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 Slidell Compares to Other Months

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

This table compares monthly weather conditions in Slidell, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)98 mm (3.9 inches)82%moderate
February Weather15°C (59°F)107 mm (4.2 inches)80%very high
March Weather18°C (65°F)80 mm (3.1 inches)80%very high
April Weather20°C (69°F)126 mm (5.0 inches)78%extreme
May Weather25°C (77°F)140 mm (5.5 inches)73%extreme
June Weather27°C (81°F)223 mm (8.8 inches)71%extreme
July Weather28°C (83°F)189 mm (7.4 inches)79%extreme
August Weather28°C (83°F)224 mm (8.8 inches)78%extreme
September Weather27°C (80°F)130 mm (5.1 inches)80%very high
October Weather23°C (74°F)126 mm (5.0 inches)76%very high
November Weather16°C (61°F)60 mm (2.3 inches)83%high
December Weather14°C (57°F)103 mm (4.1 inches)87%moderate

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