December Weather in Gretna, United States

Last updated: June 24, 2025

In Gretna, United States, the average temperature in December hovers around 14°C (58°F). Expect chilly minimums of 3°C (37°F) and pleasantly warm highs reaching up to 26°C (80°F). During this month, precipitation averages 101 mm (4.0 in) over the course of 12 days, while the air remains quite humid with an average humidity level of 84%.

December Temperature in Gretna

In December in Gretna, the average temperature is 14°C (58°F). The maximum can reach 26°C (80°F), while the minimum can drop to as low as 3°C (37°F). This weather makes Gretna a great destination for travelers looking to enjoy mild conditions and explore outdoor activities.

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

The chart illustrates December temperature patterns in Gretna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gretna, December typically has an average temperature of 14°C (58°F), with highs reaching up to 26°C (80°F) and lows dropping to around 3°C (37°F).

Data source: Temperature data for Gretna generated using information from the Copernicus Climate Change Service.

December Precipitation in Gretna

In Gretna in December, the precipitation amount is 101 mm (4.0 in) spread over 12 days.

December Precipitation Trends in Gretna

The chart displays monthly precipitation patterns in Gretna, 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 Gretna, December typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Gretna

In Gretna in December humidity is 84%. With an average temperature of 14°C (58°F), this humidity feels like a heavy blanket enveloping you, making every step feel sluggish and damp, which can be uncomfortable for traveling.

December Average Humidity in Gretna

This chart illustrates the average monthly humidity levels in Gretna, 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 Gretna is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Gretna

In Gretna in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Gretna.

Maximum UV Index Levels in Gretna for December

The chart shows the monthly maximum UV Index (UVI) for Gretna 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 Gretna typically reaches 5, which falls under the moderate exposure category.

Data source: Gretna 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 Gretna Compares to Other Months

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

This table compares monthly weather conditions in Gretna, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	90 mm (3.5 inches)	81%	moderate
February Weather	15°C (60°F)	96 mm (3.8 inches)	81%	very high
March Weather	18°C (65°F)	87 mm (3.4 inches)	79%	very high
April Weather	21°C (70°F)	113 mm (4.5 inches)	81%	extreme
May Weather	25°C (77°F)	144 mm (5.7 inches)	77%	extreme
June Weather	27°C (81°F)	218 mm (8.6 inches)	74%	extreme
July Weather	28°C (83°F)	219 mm (8.6 inches)	74%	extreme
August Weather	28°C (83°F)	273 mm (10.8 inches)	73%	extreme
September Weather	27°C (80°F)	147 mm (5.8 inches)	79%	very high
October Weather	23°C (74°F)	133 mm (5.2 inches)	77%	very high
November Weather	17°C (62°F)	58 mm (2.3 inches)	81%	high
December Weather	14°C (58°F)	101 mm (4.0 inches)	84%	moderate