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December Weather in Santa Clara, United States

Last updated: June 24, 2025

In December, the average temperature in Santa Clara, United States hovers around 5°C (40°F), with a minimum dip of -8°C (18°F) and a maximum warm-up to 20°C (69°F). Expect about 34 mm (1.3 in) of precipitation over 5 days, contributing to an average humidity of 80%. Be prepared for a mix of chilly and pleasant days!

December Temperature in Santa Clara

In December in Santa Clara, the average temperature is 5°C (40°F). Maximum temperatures can reach 20°C (69°F), while the minimum can dip as low as -8°C (18°F). Travelers should pack layers to prepare for a range of weather conditions during this time.

December Weather in Santa Clara: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santa Clara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Clara, December typically has an average temperature of 5°C (40°F), with highs reaching up to 20°C (69°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec394350606881868576605040
Data source: Temperature data for Santa Clara 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 Santa Clara

In Santa Clara in December, the precipitation amount is 34 mm (1.3 in) over the course of 5 days.

December Precipitation Trends in Santa Clara

The chart displays monthly precipitation patterns in Santa Clara, 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 Santa Clara, December typically receives around 34 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec45384411141895132734
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santa Clara

In Santa Clara in December, humidity is 80%. With an average temperature of 5°C (40°F), this humidity feels like a damp chill settling on your skin, making travel uncomfortable and requiring extra layers to stay warm while navigating the cool, misty atmosphere.

December Average Humidity in Santa Clara

This chart illustrates the average monthly humidity levels in Santa Clara, 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 Santa Clara is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%82%72%62%45%34%30%31%47%62%77%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Santa Clara

In Santa Clara 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 Santa Clara for better planning.

Maximum UV Index Levels in Santa Clara for December

The chart shows the monthly maximum UV Index (UVI) for Santa Clara 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 Santa Clara typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110754
Data source: Santa Clara 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 Santa Clara Compares to Other Months

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

This table compares monthly weather conditions in Santa Clara, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)45 mm (1.8 inches)80%moderate
February Weather6°C (43°F)38 mm (1.5 inches)82%high
March Weather10°C (51°F)44 mm (1.7 inches)72%very high
April Weather16°C (61°F)11 mm (0.4 inches)62%very high
May Weather20°C (68°F)14 mm (0.5 inches)45%extreme
June Weather27°C (82°F)1 mm (0.0 inches)34%extreme
July Weather30°C (86°F)8 mm (0.3 inches)30%extreme
August Weather29°C (85°F)9 mm (0.4 inches)31%extreme
September Weather25°C (76°F)5 mm (0.2 inches)47%very high
October Weather16°C (60°F)13 mm (0.5 inches)62%high
November Weather10°C (50°F)27 mm (1.1 inches)77%moderate
December Weather5°C (40°F)34 mm (1.3 inches)80%moderate

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