December weather forecast and climate
Montara, CA

Weather in December

The first month of the winter, December, is also a moderate month in Montara, California, with average temperature fluctuating between 55.6°F (13.1°C) and 48.9°F (9.4°C).

Temperature

With an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 48.9°F (9.4°C), December is the coldest month.

Humidity

Months with the lowest humidity are November and December, with an average relative humidity of 72%.

Rainfall

In December, in Montara, the rain falls for 8.8 days. Throughout December, 1.1" (28mm) of precipitation is accumulated. In Montara, California, during the entire year, the rain falls for 77.3 days and collects up to 6.81" (173mm) of precipitation.

Ocean temperature

In December, the average ocean temperature is 54.3°F (12.4°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 9.6h of daylight, December has the shortest days of the year.

Sunshine

December has the least sunshine of the year in Montara, California, with an average of 5.7h of sunshine.

UV index

February and December, with an average maximum UV index of 3, are months with the lowest UV index in Montara. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Montara?

The coldest month in Montara is December, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 48.9°F (9.4°C).

What is the temperature in December in Montara?

The average high-temperature, in December, is 55.6°F (13.1°C), while the average low-temperature is 48.9°F (9.4°C).

What are the least humid months in Montara?

Months with the lowest humidity in Montara, California, are November and December, with an average relative humidity of 72%.

What is the average humidity in December in Montara?

In Montara, California, the average relative humidity in December is 72%.

How much does it rain in Montara in December?

In Montara, California, in December, it is raining for 8.8 days, with typically 1.1" (28mm) of accumulated precipitation.

What is the water temperature in December in Montara?

In Montara, the average seawater temperature in December is 54.3°F (12.4°C). 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.

What is the month with the shortest days in Montara?

The month with the shortest days in Montara, California, is December, with an average of 9.6h of daylight.

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

In Montara, the average length of the day in December is 9.6h.

What is the month with the least sunshine in Montara?

The month with the least sunshine in Montara, California, is December, with an average of 5.7h of sunshine.

How long on average sun shines in December in Montara?

In December, the average sunshine is 5.7h.

What are the months with the lowest UV index in Montara?

February and December, with an average maximum UV index of 3, are months with the lowest UV index in Montara, California.

What is the UV index reading in December in Montara?

In Montara, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in December
Montara, CA

Average temperature in December - Montara, CA
  • Average high temperature in December: 55.6°F

The warmest month (with the highest average high temperature) is September (67.5°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in December: 48.9°F

The month with the highest average low temperature is September (56.8°F).
The coldest months (with the lowest average low temperature) are January and February (48.7°F).

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Average pressure in December
Montara, CA

Average pressure in December - Montara, CA
  • Average pressure in December: 30.1"

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
Montara, CA

Average wind speed in December - Montara, CA
  • Average wind speed in December: 8.1mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest months (with the lowest average wind speed) are August and September (6.8mph).

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Average humidity in December
Montara, CA

Average humidity in December - Montara, CA
  • Average humidity in December: 72%

The month with the highest relative humidity is August (82%).
Months with the lowest relative humidity are November and December (72%).

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Average rainfall in December
Montara, CA

Average rainfall in December - Montara, CA
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is February (1.34").
The driest months (with the least rainfall) are June, July and September (0.12").

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Average rainfall days in December
Montara, CA

Average rainfall days in December - Montara, CA
  • Average rainfall days in December: 8.8 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is September (3.6 days).

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Average sea temperature in December
Montara, CA

Average sea temperature in December - Montara, CA
  • Average sea temperature in December: 54.3°F

The best month for swimming (with the highest average sea temperature) is September (56.9°F).
The coldest month (with the lowest average sea temperature) is June (52.4°F).

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

Average daylight in December / Average sunshine in December - Montara, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.7h

The month with the most sunshine is July (Average sunshine: 11.1h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in December
Montara, CA

Average sunshine days in December - Montara, CA
  • Average sunshine days in December: 20.7 days

The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is August (18.7 days).

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Average UV index in December
Montara, CA

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

Months with the highest UV index are June, August and September (UV index 5).
Months with the lowest UV index are February and December (UV index 3).

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Average cloud cover in December
Montara, CA

Average cloud cover in December - Montara, CA
  • Average cloud cover in December: 36

The month with the most cloud cover is March (Cloud cover 39).
Months with the least cloud cover are September and October (Cloud cover 21).

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Average visibility in December
Montara, CA

Average visibility in December - Montara, 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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