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December Weather in Rockwall, United States

Last updated: June 24, 2025

In December, the average temperature in Rockwall, United States hovers around 11°C (51°F). Temperatures can swing from a chilly -5°C (23°F) to a warm 27°C (81°F), offering a diverse climate experience. Expect approximately 73 mm (2.9 in) of precipitation over 7 days, with an average humidity of 87%, making for a damp and refreshing atmosphere.

December Temperature in Rockwall

In December in Rockwall, the average temperature is 11°C (51°F). The maximum can reach 27°C (81°F) and the minimum can be as low as -5°C (23°F). It's essential to pack layers to accommodate the wide range of temperatures for your travels.

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

The chart illustrates December 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, December typically has an average temperature of 11°C (51°F), with highs reaching up to 27°C (81°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec464960657481848479675651
Data source: Temperature data for Rockwall generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Rockwall

In Rockwall in December, the precipitation amount is 73 mm (2.9 in) during a span of 7 days.

December Precipitation Trends in Rockwall

The chart displays monthly precipitation patterns in Rockwall, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Rockwall, December typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec64111121138181915595891485873
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rockwall

In Rockwall in December humidity is 87%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill wrapping around you, making outdoor excursions a bit uncomfortable as the air feels thick and heavy, urging you to seek shelter more often than not.

December Average Humidity in Rockwall

This chart illustrates the average monthly humidity levels in Rockwall, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Rockwall is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rockwall

In Rockwall in December, 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 December

The chart shows the monthly maximum UV Index (UVI) for Rockwall in December, 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 December, the maximum UV index in Rockwall typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Rockwall December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)64 mm (2.5 inches)80%moderate
February Weather9°C (49°F)111 mm (4.4 inches)79%high
March Weather15°C (60°F)121 mm (4.8 inches)78%very high
April Weather18°C (65°F)138 mm (5.4 inches)78%very high
May Weather23°C (74°F)180 mm (7.1 inches)81%extreme
June Weather27°C (81°F)91 mm (3.6 inches)78%extreme
July Weather29°C (85°F)55 mm (2.2 inches)73%extreme
August Weather29°C (84°F)95 mm (3.7 inches)66%extreme
September Weather26°C (79°F)89 mm (3.5 inches)65%very high
October Weather20°C (68°F)148 mm (5.8 inches)72%very high
November Weather13°C (56°F)58 mm (2.3 inches)82%high
December Weather11°C (51°F)73 mm (2.9 inches)87%moderate

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