December weather forecast
Santa Barbara, CA

Orange rooftops of the courthouse buildings of Santa Barbara in California, Pacific Ocean
Orange rooftops of the courthouse buildings of Santa Barbara in California, Pacific Ocean

Weather in December

The first month of the winter, December, is still a mild month in Santa Barbara, California, with an average temperature varying between 48.6°F (9.2°C) and 60.6°F (15.9°C).

Temperature

December is the coldest month, with an average high-temperature of 60.6°F (15.9°C) and an average low-temperature of 48.6°F (9.2°C).

Humidity

The average relative humidity in December is 60%.

Rainfall

In Santa Barbara, California, during 5.7 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Santa Barbara, during the entire year, the rain falls for 43.7 days and collects up to 7.68" (195mm) of precipitation.

Ocean temperature

In Santa Barbara, the average water temperature is 58.5°F (14.7°C).
Note: Swimming in 58.5°F (14.7°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

With an average of 9h and 54min of daylight, December has the shortest days of the year in Santa Barbara.
On the first day of the month, sunrise is at 6:47 am and sunset at 4:48 pm. On the last day of December, in Santa Barbara, sunrise is at 7:05 am and sunset at 4:58 pm PST.

Sunshine

The average sunshine in December is 6.8h.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Santa Barbara, California. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in December interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in Santa Barbara?

With an average high-temperature of 60.6°F (15.9°C) and an average low-temperature of 48.6°F (9.2°C), December is the coldest month in Santa Barbara.

What is the temperature in December in Santa Barbara?

In December, in Santa Barbara, the average high-temperature is 60.6°F (15.9°C), and the average low-temperature is 48.6°F (9.2°C).

What is the average humidity in December in Santa Barbara?

In December, the average relative humidity is 60%.

How many days does it rain in December in Santa Barbara?

In Santa Barbara, California, during December, the rain falls for 5.7 days and regularly aggregates up to 1.34" (34mm) of precipitation.

What is the ocean temperature in December in Santa Barbara?

In December, the average ocean temperature is 58.5°F (14.7°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 Santa Barbara?

December has the shortest days of the year in Santa Barbara, with an average of 9h and 54min of daylight.

How many hours of daylight does Santa Barbara have in December?

The average day length in December in Santa Barbara, California, is 9h and 54min.

When is the sunrise / sunset in December in Santa Barbara?

In December, on the first day of the month, sunrise is at 6:47 am and sunset at 4:48 pm. On the last day of the month, in Santa Barbara, sunrise is at 7:05 am and sunset at 4:58 pm PST.

How many hours of sunshine does Santa Barbara have in December?

The average sunshine duration in December in Santa Barbara is 6.8h.

When is the lowest UV index in Santa Barbara?

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Santa Barbara, California.

What is the UV index reading in December in Santa Barbara?

In Santa Barbara, California, the average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in December
Santa Barbara, CA

Average temperature in December - Santa Barbara, CA
  • Average high temperature in December: 60.6°F

The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (60.6°F).

  • Average low temperature in December: 48.6°F

The month with the highest average low temperature is August (62.1°F).
The coldest month (with the lowest average low temperature) is February (47.7°F).

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Average pressure in December
Santa Barbara, CA

Average pressure in December - Santa Barbara, CA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

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Average wind speed in December
Santa Barbara, CA

Average wind speed in December - Santa Barbara, CA
  • Average wind speed in December: 6.6mph

The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).

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Average humidity in December
Santa Barbara, CA

Average humidity in December - Santa Barbara, CA
  • Average humidity in December: 60%

The month with the highest relative humidity is March (64%).
The months with the lowest relative humidity are September, October and November (56%).

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Average rainfall in December
Santa Barbara, CA

Average rainfall in December - Santa Barbara, CA
  • Average rainfall in December: 1.34"

The wettest month (with the highest rainfall) is January (1.57").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in December
Santa Barbara, CA

Average rainfall days in December - Santa Barbara, CA
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.2 days).

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Average sea temperature in December
Santa Barbara, CA

Average sea temperature in December - Santa Barbara, CA
  • Average sea temperature in December: 58.5°F

The best month for swimming (with the highest average sea temperature) is August (62.2°F).
The coldest month (with the lowest average sea temperature) is April (55.7°F).

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Average daylight in December /
Average sunshine in December
Santa Barbara, CA

Average daylight in December / Average sunshine in December - Santa Barbara, CA
  • Average daylight in December: 9h and 54min

The month with the longest days is June (Average daylight: 14h and 25min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 48min

The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).

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Average sunshine days in December
Santa Barbara, CA

Average sunshine days in December - Santa Barbara, CA
  • Average sunshine days in December: 24.6 days

The month with the most sunshine days is August (28 days).
The month with the least sunshine days is February (21.6 days).

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Average UV index in December
Santa Barbara, CA

Average UV index in December - Santa Barbara, CA
  • Average UV index in December: 4

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in December
Santa Barbara, CA

Average cloud cover in December - Santa Barbara, CA
  • Average cloud cover in December: 22

The month with the most cloud cover is March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in December
Santa Barbara, CA

Average visibility in December - Santa Barbara, 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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