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December Weather in Royal City, United States

Last updated: June 24, 2025

In December, the average temperature in Royal City, United States hovers around 1°C (33°F). Expect a chilly appeal with minimums dropping to -11°C (13°F) and reaching highs of 19°C (66°F). With 36 mm (1.4 in) of precipitation over 9 days, be prepared for dampness, accentuated by an average humidity of 86%. A cozy sweater is a must!

December Temperature in Royal City

In December in Royal City, the average temperature is 1°C (33°F). Maximums can reach 19°C (66°F) and minimums can be as low as -11°C (13°F). Be sure to pack layers and prepare for a wide range of temperatures while exploring Royal City this month!

December Weather in Royal City: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Royal City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Royal City, December typically has an average temperature of 1°C (33°F), with highs reaching up to 19°C (66°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec313344536471787766524033
Data source: Temperature data for Royal City 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 Royal City

In Royal City in December, the precipitation amount is 36 mm (1.4 in) over the course of 9 days.

December Precipitation Trends in Royal City

The chart displays monthly precipitation patterns in Royal City, 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 Royal City, December typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec433724241461312303536
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Royal City

In Royal City in December humidity is 86%. With average temperature 1°C (33°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers for warmth to counteract the dampness in the air.

December Average Humidity in Royal City

This chart illustrates the average monthly humidity levels in Royal City, 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 Royal City is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Royal City

In Royal City 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 Royal City, you can visit Hourly UV Index in Royal City.

Maximum UV Index Levels in Royal City for December

The chart shows the monthly maximum UV Index (UVI) for Royal City 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 Royal City typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356891097532
Data source: Royal City 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 Royal City Compares to Other Months

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

This table compares monthly weather conditions in Royal City, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)43 mm (1.7 inches)85%low
February Weather1°C (33°F)37 mm (1.5 inches)86%moderate
March Weather7°C (44°F)24 mm (1.0 inches)86%moderate
April Weather12°C (53°F)24 mm (1.0 inches)82%high
May Weather18°C (64°F)14 mm (0.6 inches)77%very high
June Weather22°C (71°F)6 mm (0.2 inches)79%very high
July Weather26°C (78°F)1 mm (0.0 inches)77%very high
August Weather25°C (77°F)3 mm (0.1 inches)62%very high
September Weather19°C (67°F)12 mm (0.5 inches)60%high
October Weather11°C (52°F)30 mm (1.2 inches)80%moderate
November Weather5°C (40°F)35 mm (1.4 inches)87%moderate
December Weather1°C (33°F)36 mm (1.4 inches)86%low

Compare Royal City's Climate with Cities Worldwide