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December Weather in Clearlake Oaks, United States

Last updated: June 24, 2025

In December, the average temperature in Clearlake Oaks, United States hovers around 8°C (46°F). You may experience a minimum temperature of -3°C (28°F) and a pleasant maximum of 23°C (74°F). Prepare for some rain, as the area sees approximately 94 mm (3.7 in) of precipitation over 8 days this month, with an average humidity of 84%.

December Temperature in Clearlake Oaks

In December in Clearlake Oaks, the average temperature is 8°C (46°F). Maximums can reach 23°C (74°F) and minimums can be as low as -3°C (28°F). This temperature range makes it essential for travelers to pack both lightweight clothes for the warmer days and warm layers for the cooler nights.

December Weather in Clearlake Oaks: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Clearlake Oaks, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clearlake Oaks, December typically has an average temperature of 8°C (46°F), with highs reaching up to 23°C (74°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec454749556171777771615246
Data source: Temperature data for Clearlake Oaks 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 Clearlake Oaks

In Clearlake Oaks in December, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.

December Precipitation Trends in Clearlake Oaks

The chart displays monthly precipitation patterns in Clearlake Oaks, 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 Clearlake Oaks, December typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec14415710450383014425794
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Clearlake Oaks

In Clearlake Oaks in December humidity is 84%. With an average temperature of 8°C (46°F), this humidity feels like a chilly mist wrapping around you, making outdoor exploration cumbersome and layering your clothing a necessity for comfort.

December Average Humidity in Clearlake Oaks

This chart illustrates the average monthly humidity levels in Clearlake Oaks, 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 Clearlake Oaks is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%80%80%76%70%66%68%72%84%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Clearlake Oaks

In Clearlake Oaks 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 Clearlake Oaks, you can check the information here.

Maximum UV Index Levels in Clearlake Oaks for December

The chart shows the monthly maximum UV Index (UVI) for Clearlake Oaks 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 Clearlake Oaks typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111119743
Data source: Clearlake Oaks 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 Clearlake Oaks Compares to Other Months

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

This table compares monthly weather conditions in Clearlake Oaks, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)144 mm (5.7 inches)86%moderate
February Weather8°C (48°F)157 mm (6.2 inches)84%moderate
March Weather9°C (49°F)104 mm (4.1 inches)83%high
April Weather13°C (56°F)50 mm (2.0 inches)80%very high
May Weather16°C (62°F)38 mm (1.5 inches)80%extreme
June Weather22°C (71°F)3 mm (0.1 inches)76%extreme
July Weather25°C (78°F)0 mm (0.0 inches)70%extreme
August Weather25°C (77°F)1 mm (0.0 inches)66%extreme
September Weather21°C (71°F)4 mm (0.1 inches)68%very high
October Weather16°C (62°F)42 mm (1.6 inches)72%high
November Weather11°C (52°F)57 mm (2.3 inches)84%moderate
December Weather8°C (46°F)94 mm (3.7 inches)84%moderate

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