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December Weather in Richardson, United States

Last updated: June 24, 2025

In December, the average temperature in Richardson, United States hovers around 11°C (51°F). Be prepared for some variability: temperatures can dip to a chilly -5°C (23°F), while the mercury might rise to a pleasant 28°C (82°F). Expect 67 mm (2.6 in) of precipitation spread over about 7 days, and don't forget that the air is typically quite humid, with an average humidity level of 87%.

December Temperature in Richardson

In December in Richardson, the average temperature is 11°C (51°F). The maximum can reach 28°C (82°F), while the minimum can drop as low as -5°C (23°F). Travelers should be prepared for a wide range of temperatures to fully enjoy their visit.

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

The chart illustrates December temperature patterns in Richardson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Richardson, December typically has an average temperature of 11°C (51°F), with highs reaching up to 28°C (82°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec464960657481858479675651
Data source: Temperature data for Richardson 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 Richardson

In Richardson in December, the total precipitation amount is 67 mm (2.6 in) over a span of 7 days.

December Precipitation Trends in Richardson

The chart displays monthly precipitation patterns in Richardson, 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 Richardson, December typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec59102120121177865198921465967
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Richardson

In Richardson 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 Richardson

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

In Richardson 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 Richardson for better planning.

Maximum UV Index Levels in Richardson for December

The chart shows the monthly maximum UV Index (UVI) for Richardson 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 Richardson typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Richardson 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 Richardson Compares to Other Months

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

This table compares monthly weather conditions in Richardson, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)59 mm (2.3 inches)80%moderate
February Weather9°C (49°F)102 mm (4.0 inches)79%high
March Weather15°C (60°F)120 mm (4.7 inches)78%very high
April Weather18°C (65°F)121 mm (4.8 inches)78%very high
May Weather23°C (74°F)177 mm (7.0 inches)81%extreme
June Weather27°C (81°F)86 mm (3.4 inches)78%extreme
July Weather29°C (85°F)50 mm (2.0 inches)73%extreme
August Weather29°C (85°F)98 mm (3.9 inches)66%extreme
September Weather26°C (79°F)92 mm (3.6 inches)65%very high
October Weather20°C (68°F)146 mm (5.8 inches)72%very high
November Weather13°C (56°F)58 mm (2.3 inches)82%high
December Weather11°C (51°F)67 mm (2.6 inches)87%moderate

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