December weather forecast and climate
Monterey, CA

The rugged mountainous coast of Big Sur in Monterey, California
The rugged mountainous coast of Big Sur in Monterey, California

Weather in December

December, the first month of the winter, in Monterey, is also a moderate month, with temperature in the range of an average low of 46.4°F (8°C) and an average high of 57.2°F (14°C).

Temperature

The coldest month is December, with an average high-temperature of 57.2°F (14°C) and an average low-temperature of 46.4°F (8°C).

Humidity

In December, the average relative humidity is 71%.

Rainfall

December is the month with the most rainfall in Monterey. Rain falls for 9.9 days and accumulates 2.4" (61mm) of precipitation.

Ocean temperature

In Monterey, the average water temperature is 55.6°F (13.1°C).
Note: Swimming in 55.6°F (13.1°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The month with the shortest days in Monterey, California, is December, with an average of 9.7h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 6h of sunshine.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Monterey?

With an average high-temperature of 57.2°F (14°C) and an average low-temperature of 46.4°F (8°C), December is the coldest month.

What is the temperature in December in Monterey?

In December, the average high-temperature is 57.2°F (14°C), and the average low-temperature is 46.4°F (8°C).

What is the average humidity in December in Monterey?

In Monterey, California, the average relative humidity in December is 71%.

How many days does it rain in December in Monterey?

In Monterey, in December, during 9.9 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

What is the wettest month in Monterey?

The month with the most rainfall in Monterey is December when the rain falls for 9.9 days and typically aggregates up to 2.4" (61mm) of precipitation.

What is the water temperature in December in Monterey?

In Monterey, the average seawater temperature in December is 55.6°F (13.1°C). Swimming in 55.6°F (13.1°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Monterey?

With an average of 9.7h of daylight, December has the shortest days of the year.

What is the average length of the day in December in Monterey?

The average length of the day in December in Monterey is 9.7h.

What is the month with the least sunshine in Monterey?

With an average of 6h of sunshine, December has the least sunshine of the year in Monterey, California.

How long on average sun shines in December in Monterey?

In Monterey, California, the average sunshine in December is 6h.

What is the month with the lowest UV index in Monterey?

December is the month with the lowest UV index in Monterey, with an average maximum UV index of 3.

What is the UV index intensity in December in Monterey?

In December, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Monterey, CA

Average temperature in December - Monterey, CA
  • Average high temperature in December: 57.2°F

The warmest month (with the highest average high temperature) is September (72.5°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in December: 46.4°F

Months with the highest average low temperature are August and September (55.2°F).
The coldest month (with the lowest average low temperature) is February (46°F).

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Average pressure in December
Monterey, CA

Average pressure in December - Monterey, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in December
Monterey, CA

Average wind speed in December - Monterey, CA
  • Average wind speed in December: 6.4mph

The windiest months (with the highest average wind speed) are April and May (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
Monterey, CA

Average humidity in December - Monterey, CA
  • Average humidity in December: 71%

Months with the highest relative humidity are March and May (76%).
The month with the lowest relative humidity is November (68%).

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Average rainfall in December
Monterey, CA

Average rainfall in December - Monterey, CA
  • Average rainfall in December: 2.4"

The wettest month (with the highest rainfall) is December (2.4").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in December
Monterey, CA

Average rainfall days in December - Monterey, CA
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (1.1 days).

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Average sea temperature in December
Monterey, CA

Average sea temperature in December - Monterey, CA
  • Average sea temperature in December: 55.6°F

The best months for swimming (with the highest average sea temperature) are August and September (58.1°F).
The coldest month (with the lowest average sea temperature) is April (53.8°F).

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Average daylight in December /
Average sunshine in December
Monterey, CA

Average daylight in December / Average sunshine in December - Monterey, CA
  • Average daylight in December: 9.7h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in December: 6h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in December
Monterey, CA

Average sunshine days in December - Monterey, CA
  • Average sunshine days in December: 20 days

The month with the most sunshine days is July (27.3 days).
The month with the least sunshine days is March (16.8 days).

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Average UV index in December
Monterey, CA

Average UV index in December - Monterey, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in December
Monterey, CA

Average cloud cover in December - Monterey, CA
  • Average cloud cover in December: 32

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in December
Monterey, CA

Average visibility in December - Monterey, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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