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December Weather in Campbell, United States

Last updated: June 24, 2025

In December, the average temperature in Campbell, United States is a cool 10°C (51°F). Expect a range of temperatures, with a minimum of -6°C (22°F) and a maximum soaring to 27°C (80°F). The month typically sees about 85 mm (3.4 in) of precipitation spread over 7 days, leading to an average humidity level of 87%.

December Temperature in Campbell

In December in Campbell, the average temperature is 10°C (51°F). The maximum can reach 27°C (80°F), while the minimum can be as low as -6°C (22°F). This range indicates that travelers should be prepared for both warm days and chilly nights.

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

The chart illustrates December temperature patterns in Campbell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Campbell, December typically has an average temperature of 10°C (51°F), with highs reaching up to 27°C (80°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec464859647380848378675551
Data source: Temperature data for Campbell 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 Campbell

In Campbell in December, the precipitation amount is 85 mm (3.4 in) over the course of 7 days.

December Precipitation Trends in Campbell

The chart displays monthly precipitation patterns in Campbell, 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 Campbell, December typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec811221301891811045894831436086
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Campbell

In Campbell in December humidity is 87%. With an average temperature of 10°C (51°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities uncomfortable and sticky, and often requiring frequent breaks to stay hydrated and cool.

December Average Humidity in Campbell

This chart illustrates the average monthly humidity levels in Campbell, 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 Campbell is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Campbell

In Campbell 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 Campbell for better planning.

Maximum UV Index Levels in Campbell for December

The chart shows the monthly maximum UV Index (UVI) for Campbell 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 Campbell typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Campbell 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 Campbell Compares to Other Months

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

This table compares monthly weather conditions in Campbell, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)81 mm (3.2 inches)80%moderate
February Weather9°C (48°F)122 mm (4.8 inches)79%high
March Weather15°C (59°F)130 mm (5.1 inches)78%very high
April Weather18°C (64°F)189 mm (7.4 inches)78%very high
May Weather23°C (73°F)181 mm (7.1 inches)81%extreme
June Weather27°C (81°F)104 mm (4.1 inches)78%extreme
July Weather29°C (84°F)58 mm (2.3 inches)73%extreme
August Weather29°C (84°F)94 mm (3.7 inches)66%extreme
September Weather26°C (79°F)83 mm (3.3 inches)65%very high
October Weather19°C (67°F)143 mm (5.6 inches)72%very high
November Weather13°C (56°F)60 mm (2.3 inches)82%high
December Weather10°C (51°F)85 mm (3.4 inches)87%moderate

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