December weather forecast
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 still a mild month, with an average temperature fluctuating between 57.2°F (14°C) and 46.4°F (8°C).

Temperature

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.

Humidity

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

Rainfall

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

Ocean temperature

In Monterey, the average seawater temperature in December is 55.6°F (13.1°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

With an average of 9h and 43min of daylight, December has the shortest days of the year in Monterey, California.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:52 pm. On the last day of December, sunrise is at 7:19 am and sunset at 5:01 pm PST.

Sunshine

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

UV index

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the coldest month in Monterey?

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

What is the temperature in December in Monterey?

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

What is the rainiest month in Monterey?

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

How much does it rain in Monterey in December?

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

What is the water temperature in December in Monterey?

In Monterey, in December, the average water temperature is 55.6°F (13.1°C). 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.

What is the month with the shortest days in Monterey?

December has the shortest days of the year in Monterey, with an average of 9h and 43min of daylight.

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

In December, the average day length in Monterey, California, is 9h and 43min.

What time are sunrise and sunset in December in Monterey?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:01 pm PST.

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.

How long on average sun shines in December in Monterey?

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

When is the lowest UV index in Monterey?

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

What is the UV index reading in December in Monterey?

The average daily maximum UV index in December in Monterey, California, is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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

The 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"Hg

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

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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%

The 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: 9h and 43min

The month with the longest days is June (Average daylight: 14h and 37min).
The month with the shortest days is December (Average daylight: 9h and 43min).

  • 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

The 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

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

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