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December Weather in Livermore, United States

Last updated: June 24, 2025

In December, the average temperature in Livermore, United States hovers around 9°C (49°F). Expect a minimum of -2°C (29°F) and a maximum of 21°C (71°F), offering a range of experiences throughout the month. Be prepared for 78 mm (3.1 in) of precipitation spread over 9 days, contributing to an overall average humidity of 80%. Whether you're exploring the outdoors or enjoying the cozy indoors, it's a month that brings both variety and charm!

December Temperature in Livermore

In December in Livermore, the average temperature is 9°C (49°F). Maximum temperatures can reach 21°C (71°F), while minimum temperatures can drop as low as -2°C (29°F). Be prepared for a mix of cool days and warmer afternoons when planning your trip.

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

The chart illustrates December temperature patterns in Livermore, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Livermore, December typically has an average temperature of 9°C (49°F), with highs reaching up to 21°C (71°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec495153586369727269635549
Data source: Temperature data for Livermore 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 Livermore

In Livermore in December, the precipitation amount is 78 mm (3.1 in) over the course of 9 days.

December Precipitation Trends in Livermore

The chart displays monthly precipitation patterns in Livermore, 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 Livermore, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec93817428161002223578
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Livermore

In Livermore in December, humidity is 80%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and prompting a need for layered clothing to stay comfortable while traveling.

December Average Humidity in Livermore

This chart illustrates the average monthly humidity levels in Livermore, 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 Livermore is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Livermore

In Livermore 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 Livermore, you can check the information here.

Maximum UV Index Levels in Livermore for December

The chart shows the monthly maximum UV Index (UVI) for Livermore 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 Livermore typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109753
Data source: Livermore 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 Livermore Compares to Other Months

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

This table compares monthly weather conditions in Livermore, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)93 mm (3.7 inches)82%moderate
February Weather11°C (51°F)81 mm (3.2 inches)84%moderate
March Weather12°C (54°F)74 mm (2.9 inches)82%very high
April Weather14°C (58°F)28 mm (1.1 inches)78%very high
May Weather17°C (63°F)16 mm (0.6 inches)71%extreme
June Weather20°C (69°F)1 mm (0.0 inches)64%extreme
July Weather22°C (72°F)0 mm (0.0 inches)58%extreme
August Weather22°C (72°F)0 mm (0.0 inches)54%very high
September Weather21°C (69°F)2 mm (0.1 inches)55%very high
October Weather17°C (63°F)22 mm (0.9 inches)62%high
November Weather13°C (55°F)35 mm (1.4 inches)78%moderate
December Weather9°C (49°F)78 mm (3.1 inches)80%moderate

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