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December Weather in Oakley, United States

Last updated: June 24, 2025

In December, the average temperature in Oakley, United States hovers around -4°C (25°F). Dramatic fluctuations are common, with temperatures dipping as low as -20°C (-3°F) and peaking at a milder 13°C (56°F). Visitors should prepare for some precipitation, averaging 48 mm (1.9 in) spread over 11 days, and brace themselves for high humidity levels of 87%.

December Temperature in Oakley

In December in Oakley, the average temperature is -4°C (25°F), with maximums reaching 13°C (56°F) and minimums dropping as low as -20°C (-3°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for their trip.

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

The chart illustrates December temperature patterns in Oakley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oakley, December typically has an average temperature of -4°C (25°F), with highs reaching up to 13°C (56°F) and lows dropping to around -20°C (-3°F).
JanFebMarAprMayJunJulAugSepOctNovDec252634435263737161453625
Data source: Temperature data for Oakley 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 Oakley

In Oakley in December, the precipitation amount is 48 mm (1.9 in) over a span of 11 days.

December Precipitation Trends in Oakley

The chart displays monthly precipitation patterns in Oakley, 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 Oakley, December typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec505950557435182925394149
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oakley

In Oakley in December humidity is 87%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step outside feel like an endeavor as the cold damp air numbs your senses and weighs you down, creating an atmosphere that is both invigorating and challenging for traveling.

December Average Humidity in Oakley

This chart illustrates the average monthly humidity levels in Oakley, 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 Oakley is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oakley

In Oakley 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 Oakley, you can check the information here.

Maximum UV Index Levels in Oakley for December

The chart shows the monthly maximum UV Index (UVI) for Oakley 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 Oakley typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: Oakley 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 Oakley Compares to Other Months

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

This table compares monthly weather conditions in Oakley, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)50 mm (2.0 inches)91%moderate
February Weather-3°C (27°F)59 mm (2.3 inches)92%moderate
March Weather1°C (35°F)50 mm (2.0 inches)85%high
April Weather6°C (43°F)55 mm (2.2 inches)76%very high
May Weather11°C (52°F)74 mm (2.9 inches)66%very high
June Weather17°C (63°F)35 mm (1.4 inches)62%extreme
July Weather23°C (73°F)18 mm (0.7 inches)53%extreme
August Weather21°C (71°F)29 mm (1.1 inches)42%very high
September Weather16°C (61°F)25 mm (1.0 inches)46%very high
October Weather7°C (45°F)39 mm (1.5 inches)64%high
November Weather2°C (36°F)41 mm (1.6 inches)83%moderate
December Weather-4°C (25°F)48 mm (1.9 inches)87%moderate

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