December Weather in Gretna, United States

Last updated: June 24, 2025

In December, the average temperature in Gretna, United States hovers around 6°C (44°F). Expect a range where the temperature can dip as low as -10°C (15°F) and rise to a pleasant 23°C (73°F). Rain is a possibility, with an average precipitation of 104 mm (4.1 in) over 9 days, and be prepared for high humidity levels at 85%.

December Temperature in Gretna

In December in Gretna, the average temperature is 6°C (44°F). Maximums can reach 23°C (73°F) and minimums can be as low as -10°C (15°F). Be sure to pack layers to accommodate the wide range of temperatures you'll experience while traveling.

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 6°C (44°F), with highs reaching up to 23°C (73°F) and lows dropping to around -10°C (15°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 104 mm (4.1 in) over the course of 9 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 104 mm (4.1 inches) of precipitation spread over approximately 9 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 85%. With an average temperature of 6°C (44°F), this humidity feels like a chilly dampness that seeps into your clothes, making travel uncomfortable and adding an extra layer of chill to the air.

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 85%, 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 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 Gretna, you can check the information here.

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 3, 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	4°C (40°F)	75 mm (2.9 inches)	84%	moderate
February Weather	7°C (45°F)	112 mm (4.4 inches)	84%	high
March Weather	10°C (50°F)	70 mm (2.8 inches)	84%	high
April Weather	15°C (60°F)	130 mm (5.1 inches)	82%	very high
May Weather	20°C (68°F)	118 mm (4.6 inches)	82%	very high
June Weather	24°C (75°F)	94 mm (3.7 inches)	83%	extreme
July Weather	27°C (81°F)	63 mm (2.5 inches)	79%	very high
August Weather	25°C (78°F)	105 mm (4.1 inches)	77%	very high
September Weather	23°C (73°F)	109 mm (4.3 inches)	75%	very high
October Weather	17°C (63°F)	110 mm (4.3 inches)	81%	high
November Weather	9°C (49°F)	78 mm (3.1 inches)	87%	moderate
December Weather	6°C (44°F)	104 mm (4.1 inches)	85%	moderate