nomadseason

January Weather in Round Rock, United States

Last updated: June 24, 2025

In January, the average temperature in Round Rock, United States hovers around 0°C (33°F). While you might experience crisp days with a maximum temperature reaching up to 16°C (61°F), be prepared for chilly spells, as minimum temperatures can plummet to -23°C (-8°F). With an average humidity of 85% and 22 mm (0.9 in) of precipitation spread over 6 days, it's a month that brings both brisk air and the occasional drizzle.

January Temperature in Round Rock

In January in Round Rock, the average temperature is 0°C (33°F). Maximum temperatures can reach 16°C (61°F), while minimums can drop as low as -23°C (-8°F). Travelers should be prepared for a wide range of temperatures, from chilly days to potentially freezing nights.

January Weather in Round Rock: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Round Rock, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Round Rock, January typically has an average temperature of 0°C (33°F), with highs reaching up to 16°C (61°F) and lows dropping to around -23°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec323846556376797869544433
Data source: Temperature data for Round Rock generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Round Rock

In Round Rock in January, the precipitation amount is 22 mm (0.9 in) over a span of 6 days.

January Precipitation Trends in Round Rock

The chart displays monthly precipitation patterns in Round Rock, 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 Round Rock, January typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2222321014314512211022
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in Round Rock

In Round Rock in January, humidity is 85%. With an average temperature of 0°C (33°F), this humidity feels like a heavy blanket, making the air feel colder and more biting, while creating an uncomfortable clamminess that can dampen the thrill of traveling.

January Average Humidity in Round Rock

This chart illustrates the average monthly humidity levels in Round Rock, 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 Round Rock is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%76%69%53%40%36%44%59%74%83%86%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Round Rock

In Round Rock 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 Round Rock for better planning.

Maximum UV Index Levels in Round Rock for January

The chart shows the monthly maximum UV Index (UVI) for Round Rock 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 Round Rock typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213131211864
Data source: Round Rock 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 Round Rock Compares to Other Months

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

This table compares monthly weather conditions in Round Rock, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)22 mm (0.9 inches)85%moderate
February Weather3°C (38°F)22 mm (0.9 inches)86%high
March Weather8°C (46°F)31 mm (1.2 inches)76%very high
April Weather13°C (55°F)10 mm (0.4 inches)69%extreme
May Weather17°C (63°F)14 mm (0.6 inches)53%extreme
June Weather24°C (76°F)3 mm (0.1 inches)40%extreme
July Weather26°C (80°F)14 mm (0.5 inches)36%extreme
August Weather25°C (78°F)4 mm (0.2 inches)44%extreme
September Weather21°C (69°F)12 mm (0.5 inches)59%extreme
October Weather12°C (54°F)21 mm (0.8 inches)74%very high
November Weather7°C (44°F)10 mm (0.4 inches)83%high
December Weather1°C (34°F)22 mm (0.8 inches)85%moderate

Compare Round Rock's Climate with Cities Worldwide