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December Weather in Lagunitas-Forest Knolls, United States

Last updated: June 24, 2025

In Lagunitas-Forest Knolls, United States, the average temperature in December hovers around 11°C (51°F), with a comfortable range from a minimum of 4°C (39°F) to a pleasant maximum of 21°C (69°F). This month, you can expect 102 mm (4.0 in) of precipitation spread over 9 days, accompanied by an average humidity of 79%. Plan accordingly to make the most of your visit!

December Temperature in Lagunitas-Forest Knolls

In December in Lagunitas-Forest Knolls, the average temperature is 11°C (51°F). Maximum temperatures can reach 21°C (69°F), while minimums can drop as low as 4°C (39°F). Be prepared for mild days and cool evenings if you're traveling during this time.

December Weather in Lagunitas-Forest Knolls: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Lagunitas-Forest Knolls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lagunitas-Forest Knolls, December typically has an average temperature of 11°C (51°F), with highs reaching up to 21°C (69°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec515252545659596061595451
Data source: Temperature data for Lagunitas-Forest Knolls 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 Lagunitas-Forest Knolls

In Lagunitas-Forest Knolls in December, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

December Precipitation Trends in Lagunitas-Forest Knolls

The chart displays monthly precipitation patterns in Lagunitas-Forest Knolls, 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 Lagunitas-Forest Knolls, December typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec11913182412122223554102
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lagunitas-Forest Knolls

In Lagunitas-Forest Knolls in December, humidity is 79%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill in the air, making it necessary to dress in layers while exploring the local sights, as the coolness combined with the high moisture can create an uncomfortable, sticky atmosphere for travelers.

December Average Humidity in Lagunitas-Forest Knolls

This chart illustrates the average monthly humidity levels in Lagunitas-Forest Knolls, 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 Lagunitas-Forest Knolls is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%82%79%83%84%87%87%86%80%79%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Lagunitas-Forest Knolls

In Lagunitas-Forest Knolls 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 Lagunitas-Forest Knolls, you can check the information here.

Maximum UV Index Levels in Lagunitas-Forest Knolls for December

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

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

This table compares monthly weather conditions in Lagunitas-Forest Knolls, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)118 mm (4.7 inches)85%moderate
February Weather11°C (52°F)131 mm (5.1 inches)82%moderate
March Weather11°C (52°F)82 mm (3.2 inches)82%very high
April Weather12°C (54°F)40 mm (1.6 inches)79%very high
May Weather13°C (56°F)21 mm (0.8 inches)83%very high
June Weather15°C (59°F)2 mm (0.1 inches)84%extreme
July Weather15°C (59°F)2 mm (0.1 inches)87%extreme
August Weather16°C (60°F)2 mm (0.1 inches)87%very high
September Weather16°C (62°F)2 mm (0.1 inches)86%very high
October Weather15°C (59°F)35 mm (1.4 inches)80%high
November Weather12°C (55°F)54 mm (2.1 inches)79%moderate
December Weather11°C (51°F)102 mm (4.0 inches)79%moderate

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