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December Weather in Groom, United States

Last updated: June 24, 2025

In Groom, United States, the average temperature in December hovers around 5°C (41°F), with extremes ranging from a chilly -11°C (13°F) to a mild 25°C (78°F). Expect 21 mm (0.8 in) of precipitation over just 2 days, while the average humidity remains high at 81%. Stay prepared for a blend of weather conditions this month!

December Temperature in Groom

In December in Groom, the average temperature is 5°C (41°F). Maximum temperatures can reach 25°C (78°F), while the minimum can drop as low as -11°C (13°F). Travelers should be prepared for a wide range of weather, necessitating layers and versatile clothing options.

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

The chart illustrates December temperature patterns in Groom, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Groom, December typically has an average temperature of 5°C (41°F), with highs reaching up to 25°C (78°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec383850566676797771574841
Data source: Temperature data for Groom 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 Groom

In Groom in December, the precipitation amount is 21 mm (0.8 in) over a period of 2 days.

December Precipitation Trends in Groom

The chart displays monthly precipitation patterns in Groom, 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 Groom, December typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec211446357948424952631421
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Groom

In Groom in December, humidity is 81%. With an average temperature of 5°C (41°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor exploration uncomfortable and requiring warm, waterproof clothing to stay comfortable while traveling.

December Average Humidity in Groom

This chart illustrates the average monthly humidity levels in Groom, 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 Groom is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%64%70%78%81%82%78%72%73%81%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Groom

In Groom 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 Groom for better planning.

Maximum UV Index Levels in Groom for December

The chart shows the monthly maximum UV Index (UVI) for Groom 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 Groom typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468111112121110754
Data source: Groom 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 Groom Compares to Other Months

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

This table compares monthly weather conditions in Groom, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)21 mm (0.8 inches)75%moderate
February Weather4°C (39°F)14 mm (0.6 inches)76%high
March Weather10°C (50°F)46 mm (1.8 inches)64%very high
April Weather14°C (57°F)35 mm (1.4 inches)70%extreme
May Weather19°C (67°F)79 mm (3.1 inches)78%extreme
June Weather24°C (76°F)48 mm (1.9 inches)81%extreme
July Weather26°C (79°F)42 mm (1.7 inches)82%extreme
August Weather25°C (78°F)49 mm (1.9 inches)78%extreme
September Weather22°C (71°F)52 mm (2.0 inches)72%very high
October Weather14°C (58°F)63 mm (2.5 inches)73%high
November Weather9°C (48°F)14 mm (0.5 inches)80%moderate
December Weather5°C (41°F)21 mm (0.8 inches)81%moderate

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