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December Weather in Pomona, United States

Last updated: June 24, 2025

In December, the average temperature in Pomona, United States is a brisk 5°C (42°F). Be prepared for temperature fluctuations as it can dip to a chilly -12°C (11°F) or warm up to a comfortable 25°C (77°F). Expect 77 mm (3.0 in) of precipitation spread over 8 days, contributing to an average humidity of 86%—perfect for those cozy indoor days!

December Temperature in Pomona

In December in Pomona, the average temperature is 5°C (42°F). The maximum can reach 25°C (77°F) and the minimum can be as low as -12°C (11°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit.

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

The chart illustrates December temperature patterns in Pomona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pomona, December typically has an average temperature of 5°C (42°F), with highs reaching up to 25°C (77°F) and lows dropping to around -12°C (11°F).
JanFebMarAprMayJunJulAugSepOctNovDec363950566675797773594642
Data source: Temperature data for Pomona 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 Pomona

In Pomona in December, the precipitation amount is 77 mm (3.0 in) distributed over 8 days.

December Precipitation Trends in Pomona

The chart displays monthly precipitation patterns in Pomona, 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 Pomona, December typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec841131531631877977109501277677
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Pomona

In Pomona in December, humidity is 86%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that penetrates your layers, making outdoor activities quite uncomfortable and prompting you to seek warmth indoors more often.

December Average Humidity in Pomona

This chart illustrates the average monthly humidity levels in Pomona, 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 Pomona is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Pomona

In Pomona in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Pomona, you can check the information here.

Maximum UV Index Levels in Pomona for December

The chart shows the monthly maximum UV Index (UVI) for Pomona 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 Pomona typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Pomona 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 Pomona Compares to Other Months

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

This table compares monthly weather conditions in Pomona, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)84 mm (3.3 inches)83%moderate
February Weather4°C (39°F)113 mm (4.4 inches)81%high
March Weather10°C (50°F)153 mm (6.0 inches)80%high
April Weather13°C (56°F)163 mm (6.4 inches)80%very high
May Weather19°C (67°F)187 mm (7.4 inches)83%extreme
June Weather24°C (75°F)79 mm (3.1 inches)83%extreme
July Weather26°C (79°F)77 mm (3.0 inches)76%extreme
August Weather25°C (77°F)109 mm (4.3 inches)69%very high
September Weather23°C (73°F)50 mm (2.0 inches)68%very high
October Weather15°C (60°F)127 mm (5.0 inches)72%high
November Weather8°C (46°F)76 mm (3.0 inches)83%moderate
December Weather5°C (42°F)77 mm (3.0 inches)86%moderate

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