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December Weather in Diablo Grande, United States

Last updated: June 24, 2025

In December, the average temperature in Diablo Grande, United States hovers around 10°C (50°F). Expect minimum temperatures to dip to -1°C (31°F), while you might enjoy highs reaching up to 22°C (73°F). With 78 mm (3.1 in) of precipitation spread over 9 days, it's advisable to pack an umbrella! Additionally, the average humidity is around 80%, creating a moist atmosphere throughout the month.

December Temperature in Diablo Grande

In December in Diablo Grande, the average temperature is 10°C (50°F). The maximum can reach 22°C (73°F), while the minimum can be as low as -1°C (31°F). This variation in temperature makes Diablo Grande an ideal destination for travelers looking to experience a mix of mild and cooler weather.

December Weather in Diablo Grande: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Diablo Grande, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Diablo Grande, December typically has an average temperature of 10°C (50°F), with highs reaching up to 22°C (73°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec505255616876818075665649
Data source: Temperature data for Diablo Grande 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 Diablo Grande

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

December Precipitation Trends in Diablo Grande

The chart displays monthly precipitation patterns in Diablo Grande, 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 Diablo Grande, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec93728031182002162978
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Diablo Grande

In Diablo Grande in December, humidity is 80%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill enveloping you, making traveling somewhat uncomfortable as it seeps into your clothes and clings to your skin, leaving you longing for a cozy indoor refuge.

December Average Humidity in Diablo Grande

This chart illustrates the average monthly humidity levels in Diablo Grande, 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 Diablo Grande 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 Diablo Grande

In Diablo Grande 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 Diablo Grande, you can check the information here.

Maximum UV Index Levels in Diablo Grande for December

The chart shows the monthly maximum UV Index (UVI) for Diablo Grande 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 Diablo Grande typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Diablo Grande 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 Diablo Grande Compares to Other Months

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

This table compares monthly weather conditions in Diablo Grande, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)93 mm (3.7 inches)82%moderate
February Weather11°C (52°F)72 mm (2.8 inches)84%moderate
March Weather13°C (55°F)80 mm (3.1 inches)82%very high
April Weather16°C (61°F)31 mm (1.2 inches)78%very high
May Weather20°C (68°F)18 mm (0.7 inches)71%very high
June Weather25°C (76°F)2 mm (0.1 inches)64%extreme
July Weather27°C (81°F)0 mm (0.0 inches)58%extreme
August Weather26°C (80°F)0 mm (0.0 inches)54%very high
September Weather24°C (75°F)1 mm (0.1 inches)55%very high
October Weather19°C (66°F)16 mm (0.6 inches)62%high
November Weather13°C (56°F)29 mm (1.1 inches)78%moderate
December Weather10°C (50°F)78 mm (3.1 inches)80%moderate

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