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December Weather in Pomona, United States

Last updated: June 24, 2025

In December, the average temperature in Pomona, United States hovers around 4°C (39°F). Expect a chill, with minimums plunging to -16°C (3°F), while the occasional highs can reach a pleasant 22°C (72°F). During this month, precipitation totals 32 mm (1.3 in), typically spread over 3 days, and the air remains quite humid, with an average humidity level of 84%.

December Temperature in Pomona

In December in Pomona, the average temperature is 4°C (39°F), with maximums reaching 22°C (72°F) and minimums dipping as low as -16°C (3°F). Travelers should be prepared for a wide range of temperatures during this time, ensuring they pack both warm and lighter clothing.

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 4°C (39°F), with highs reaching up to 22°C (72°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec323447556677807772574539
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 total precipitation amount is 32 mm (1.3 in) over a span of 3 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 32 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec53359594202111105121801183832
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 84%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions uncomfortable and demanding more layers than you anticipate while traveling.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109743
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 Weather0°C (33°F)53 mm (2.1 inches)76%moderate
February Weather1°C (34°F)35 mm (1.4 inches)77%high
March Weather9°C (48°F)95 mm (3.7 inches)70%high
April Weather13°C (55°F)94 mm (3.7 inches)73%very high
May Weather19°C (66°F)202 mm (7.9 inches)82%very high
June Weather25°C (78°F)111 mm (4.4 inches)82%extreme
July Weather27°C (80°F)105 mm (4.1 inches)81%extreme
August Weather25°C (77°F)121 mm (4.8 inches)78%very high
September Weather22°C (72°F)80 mm (3.1 inches)71%very high
October Weather14°C (58°F)118 mm (4.6 inches)71%high
November Weather7°C (45°F)38 mm (1.5 inches)81%moderate
December Weather4°C (39°F)32 mm (1.3 inches)84%moderate

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