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December Weather in Plano, United States

Last updated: June 24, 2025

In Plano, United States, the average temperature in December hovers around 0°C (33°F). However, be prepared for a range of weather, as temperatures can dip as low as -21°C (-6°F) or rise as high as 19°C (67°F). Expect about 52 mm (2.0 in) of precipitation spread over 7 days, contributing to an average humidity of 84%.

December Temperature in Plano

In December in Plano, the average temperature is 0°C (33°F). The maximum can reach 19°C (67°F), and the minimum can be as low as -21°C (-6°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Plano, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plano, December typically has an average temperature of 0°C (33°F), with highs reaching up to 19°C (67°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec252739486172757267543932
Data source: Temperature data for Plano 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 Plano

In Plano in December, the precipitation amount is 52 mm (2.0 in) over a duration of 7 days.

December Precipitation Trends in Plano

The chart displays monthly precipitation patterns in Plano, 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 Plano, December typically receives around 52 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec636186117157139112811021295652
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Plano

In Plano in December humidity is 84%. With average temperature 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures less enjoyable and travel plans challenging.

December Average Humidity in Plano

This chart illustrates the average monthly humidity levels in Plano, 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 Plano is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Plano

In Plano in December, 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 Plano, you can visit Hourly UV Index in Plano.

Maximum UV Index Levels in Plano for December

The chart shows the monthly maximum UV Index (UVI) for Plano 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 Plano typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Plano 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 Plano Compares to Other Months

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

This table compares monthly weather conditions in Plano, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)63 mm (2.5 inches)82%moderate
February Weather-3°C (27°F)61 mm (2.4 inches)83%moderate
March Weather4°C (40°F)86 mm (3.4 inches)84%high
April Weather9°C (49°F)117 mm (4.6 inches)85%very high
May Weather16°C (61°F)157 mm (6.2 inches)79%very high
June Weather22°C (72°F)139 mm (5.5 inches)82%very high
July Weather24°C (75°F)112 mm (4.4 inches)80%very high
August Weather22°C (73°F)81 mm (3.2 inches)81%very high
September Weather20°C (68°F)102 mm (4.0 inches)80%very high
October Weather12°C (54°F)128 mm (5.1 inches)82%high
November Weather4°C (39°F)56 mm (2.2 inches)88%moderate
December Weather0°C (33°F)52 mm (2.0 inches)84%low

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