January Weather in Gretna, United States

Last updated: June 24, 2025

In January, the average temperature in Gretna, United States hovers around 12°C (54°F). Temperatures can range from a chilly -6°C (22°F) at the minimum to a warm 27°C (82°F) at the maximum. Expect about 82 mm (3.2 in) of precipitation over approximately 7 days, with an average humidity of 85%—perfect for cozy indoor activities!

January Temperature in Gretna

In January in Gretna, the average temperature is 12°C (54°F), with maximums reaching 27°C (82°F) and minimums dropping as low as -6°C (22°F). This wide range of temperatures makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates January 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, January typically has an average temperature of 12°C (54°F), with highs reaching up to 27°C (82°F) and lows dropping to around -6°C (22°F).

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

January Precipitation in Gretna

In Gretna in January, the precipitation amount is 82 mm (3.2 in) over the course of 7 days.

January Precipitation Trends in Gretna

The chart displays monthly precipitation patterns in Gretna, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Gretna, January typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 7 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Gretna

In Gretna in January, humidity is 85%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making traveling not only uncomfortable but also exhausting as the damp air clings to your skin and slows your movements.

January Average Humidity in Gretna

This chart illustrates the average monthly humidity levels in Gretna, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Gretna is approximately 85%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Gretna

In Gretna in January, 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 January

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

Data source: Gretna January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	82 mm (3.2 inches)	85%	moderate
February Weather	15°C (60°F)	116 mm (4.6 inches)	82%	very high
March Weather	17°C (63°F)	57 mm (2.2 inches)	80%	very high
April Weather	20°C (68°F)	101 mm (4.0 inches)	76%	very high
May Weather	24°C (76°F)	87 mm (3.4 inches)	73%	extreme
June Weather	26°C (80°F)	176 mm (6.9 inches)	74%	extreme
July Weather	27°C (81°F)	169 mm (6.6 inches)	80%	extreme
August Weather	27°C (81°F)	165 mm (6.5 inches)	79%	extreme
September Weather	26°C (79°F)	140 mm (5.5 inches)	83%	very high
October Weather	23°C (73°F)	99 mm (3.9 inches)	77%	very high
November Weather	16°C (60°F)	46 mm (1.8 inches)	84%	high
December Weather	13°C (56°F)	126 mm (5.0 inches)	88%	moderate