January Weather in Lewisville, United States

Last updated: June 24, 2025

In January, the average temperature in Lewisville, United States hovers around 5°C (41°F). While you may experience lows of -13°C (9°F), expect occasional highs reaching 14°C (58°F). Be prepared for 246 mm (9.7 in) of precipitation over the course of 17 days, with an average humidity level of 85%, making it a notably damp month.

January Temperature in Lewisville

In January in Lewisville, the average temperature is 5°C (41°F). The maximum can reach 14°C (58°F) and the minimum can be as low as -13°C (9°F). It's advisable to pack warm clothing and be prepared for significant temperature fluctuations during your travels.

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

The chart illustrates January temperature patterns in Lewisville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewisville, January typically has an average temperature of 5°C (41°F), with highs reaching up to 14°C (58°F) and lows dropping to around -13°C (9°F).

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

January Precipitation in Lewisville

In Lewisville in January, the precipitation amount is 246 mm (9.7 in) over the course of 17 days.

January Precipitation Trends in Lewisville

The chart displays monthly precipitation patterns in Lewisville, 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 Lewisville, January typically receives around 246 mm (9.7 inches) of precipitation spread over approximately 17 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 Lewisville

In Lewisville in January, humidity is 85%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration a challenge as the cold air clings to your skin.

January Average Humidity in Lewisville

This chart illustrates the average monthly humidity levels in Lewisville, 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 Lewisville 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 Lewisville

In Lewisville in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Lewisville, you can visit Hourly UV Index in Lewisville.

Maximum UV Index Levels in Lewisville for January

The chart shows the monthly maximum UV Index (UVI) for Lewisville 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 Lewisville typically reaches 2, which falls under the low exposure category.

Data source: Lewisville 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 Lewisville Compares to Other Months

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

This table compares monthly weather conditions in Lewisville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	246 mm (9.7 inches)	85%	low
February Weather	4°C (40°F)	260 mm (10.2 inches)	84%	moderate
March Weather	7°C (45°F)	189 mm (7.4 inches)	85%	moderate
April Weather	10°C (50°F)	166 mm (6.5 inches)	83%	high
May Weather	14°C (57°F)	86 mm (3.4 inches)	83%	very high
June Weather	17°C (63°F)	75 mm (3.0 inches)	83%	very high
July Weather	20°C (68°F)	10 mm (0.4 inches)	82%	very high
August Weather	20°C (69°F)	13 mm (0.5 inches)	74%	very high
September Weather	17°C (63°F)	111 mm (4.4 inches)	71%	high
October Weather	11°C (52°F)	199 mm (7.8 inches)	81%	moderate
November Weather	7°C (46°F)	260 mm (10.2 inches)	87%	moderate
December Weather	5°C (40°F)	273 mm (10.7 inches)	87%	low