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December Weather in Monterey, United States

Last updated: June 24, 2025

In December, the average temperature in Monterey, United States hovers around 7°C (44°F). Expect temperatures to range from a chilly -11°C (12°F) to a warm 23°C (73°F). This month brings about 150 mm (5.9 in) of precipitation, typically spread over 12 days, and the atmosphere remains quite damp with an average humidity of 88%.

December Temperature in Monterey

In December in Monterey, the average temperature is 7°C (44°F). Maximum temperatures can reach up to 23°C (73°F), while the minimum can drop as low as -11°C (12°F). Be sure to pack layers to prepare for the wide temperature range during your travels.

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

The chart illustrates December temperature patterns in Monterey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monterey, December typically has an average temperature of 7°C (44°F), with highs reaching up to 23°C (73°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec394551586874787672624744
Data source: Temperature data for Monterey 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 Monterey

In Monterey in December, the total precipitation amount is 150 mm (5.9 in) over the course of 12 days.

December Precipitation Trends in Monterey

The chart displays monthly precipitation patterns in Monterey, 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 Monterey, December typically receives around 150 mm (5.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec10819316115313813313313011913278150
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Monterey

In Monterey in December, humidity is 88%. With an average temperature of 7°C (44°F), this humidity feels like an unwelcoming chill that clings to your skin, making outdoor exploration uncomfortable and prompting frequent breaks in sheltered areas.

December Average Humidity in Monterey

This chart illustrates the average monthly humidity levels in Monterey, 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 Monterey is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Monterey

In Monterey 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 Monterey, you can check the information here.

Maximum UV Index Levels in Monterey for December

The chart shows the monthly maximum UV Index (UVI) for Monterey 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 Monterey typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Monterey 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 Monterey Compares to Other Months

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

This table compares monthly weather conditions in Monterey, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)108 mm (4.3 inches)87%moderate
February Weather7°C (45°F)192 mm (7.6 inches)86%high
March Weather11°C (51°F)161 mm (6.3 inches)86%high
April Weather14°C (58°F)153 mm (6.0 inches)82%very high
May Weather20°C (68°F)138 mm (5.4 inches)82%extreme
June Weather23°C (74°F)133 mm (5.2 inches)83%extreme
July Weather25°C (78°F)133 mm (5.2 inches)80%extreme
August Weather24°C (76°F)130 mm (5.1 inches)74%very high
September Weather22°C (72°F)119 mm (4.7 inches)71%very high
October Weather17°C (62°F)132 mm (5.2 inches)78%high
November Weather9°C (48°F)78 mm (3.1 inches)88%moderate
December Weather7°C (44°F)150 mm (5.9 inches)88%moderate

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