January Weather in Gretna, United States

Last updated: June 24, 2025

In January, the average temperature in Gretna, United States hovers around -4°C (25°F). Be prepared for a range of weather, as temperatures can dip as low as -30°C (-22°F) or rise up to 14°C (57°F). With an average precipitation of 32 mm (1.3 in) spread over 5 days, and a humidity level of 76%, this month promises a chilly yet captivating experience in Gretna.

January Temperature in Gretna

In January in Gretna, the average temperature is -4°C (25°F). Maximums can reach 14°C (57°F) while minimums can drop to as low as -30°C (-22°F). Travelers should be prepared for a wide range of temperatures and dress in 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 -4°C (25°F), with highs reaching up to 14°C (57°F) and lows dropping to around -30°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 32 mm (1.3 in) over the course of 5 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 32 mm (1.3 inches) of precipitation spread over approximately 5 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 76%. With an average temperature of -4°C (25°F), this humidity feels like a chilling mist that clings to your skin, making every breath feel heavy and damp, which can be quite uncomfortable for traveling.

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 76%, 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 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 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 3, 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	-4°C (25°F)	32 mm (1.3 inches)	76%	moderate
February Weather	-4°C (26°F)	30 mm (1.2 inches)	80%	moderate
March Weather	5°C (41°F)	97 mm (3.8 inches)	73%	high
April Weather	10°C (51°F)	54 mm (2.1 inches)	74%	very high
May Weather	17°C (63°F)	146 mm (5.8 inches)	78%	very high
June Weather	24°C (76°F)	126 mm (5.0 inches)	82%	very high
July Weather	26°C (78°F)	74 mm (2.9 inches)	83%	very high
August Weather	24°C (75°F)	100 mm (4.0 inches)	80%	very high
September Weather	21°C (70°F)	83 mm (3.3 inches)	75%	very high
October Weather	11°C (53°F)	115 mm (4.5 inches)	75%	high
November Weather	5°C (40°F)	31 mm (1.2 inches)	82%	moderate
December Weather	0°C (32°F)	40 mm (1.6 inches)	83%	low