January Weather in Rockwall, United States

Last updated: June 24, 2025

In January, the average temperature in Rockwall, United States is a cool 8°C (47°F). However, temperatures can swing dramatically, with a minimum of -12°C (11°F) and a maximum of 26°C (78°F). During this time, you can expect about 64 mm (2.5 in) of precipitation over 6 days and an average humidity level of 80%, making for a rather damp atmosphere.

January Temperature in Rockwall

In January in Rockwall, the average temperature is 8°C (47°F), with maximums reaching up to 26°C (78°F) and minimums dropping as low as -12°C (11°F). This variation in temperature makes Rockwall an ideal destination for travelers seeking a mix of mild and cool weather experiences.

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

The chart illustrates January temperature patterns in Rockwall, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rockwall, January typically has an average temperature of 8°C (47°F), with highs reaching up to 26°C (78°F) and lows dropping to around -12°C (11°F).

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

January Precipitation in Rockwall

In Rockwall in January, the total precipitation amount is 64 mm (2.5 in) during a span of 6 days.

January Precipitation Trends in Rockwall

The chart displays monthly precipitation patterns in Rockwall, 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 Rockwall, January typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 6 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Rockwall

In Rockwall in January, humidity is 80%. With an average temperature of 8°C (47°F), this humidity feels like you're walking through a heavy mist, making your clothes cling to your skin and every step prone to a shiver, which can be quite uncomfortable for traveling.

January Average Humidity in Rockwall

This chart illustrates the average monthly humidity levels in Rockwall, 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 Rockwall is approximately 80%, 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 Rockwall

In Rockwall in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Rockwall for better planning.

Maximum UV Index Levels in Rockwall for January

The chart shows the monthly maximum UV Index (UVI) for Rockwall 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 Rockwall typically reaches 4, which falls under the moderate exposure category.

Data source: Rockwall 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 Rockwall Compares to Other Months

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

This table compares monthly weather conditions in Rockwall, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	64 mm (2.5 inches)	80%	moderate
February Weather	9°C (49°F)	111 mm (4.4 inches)	79%	high
March Weather	15°C (60°F)	121 mm (4.8 inches)	78%	very high
April Weather	18°C (65°F)	138 mm (5.4 inches)	78%	very high
May Weather	23°C (74°F)	180 mm (7.1 inches)	81%	extreme
June Weather	27°C (81°F)	91 mm (3.6 inches)	78%	extreme
July Weather	29°C (85°F)	55 mm (2.2 inches)	73%	extreme
August Weather	29°C (84°F)	95 mm (3.7 inches)	66%	extreme
September Weather	26°C (79°F)	89 mm (3.5 inches)	65%	very high
October Weather	20°C (68°F)	148 mm (5.8 inches)	72%	very high
November Weather	13°C (56°F)	58 mm (2.3 inches)	82%	high
December Weather	11°C (51°F)	73 mm (2.9 inches)	87%	moderate