December weather forecast and climate
Isla Vista, CA

Weather in December

December, the first month of the winter, in Isla Vista, is also a moderate month, with average temperature fluctuating between 48.6°F (9.2°C) and 60.6°F (15.9°C).

Temperature

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.

Humidity

In Isla Vista, California, the average relative humidity in December is 60%.

Rainfall

In Isla Vista, it is raining for 5.7 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, there are 43.7 rainfall days, and 7.68" (195mm) of precipitation is accumulated.

Ocean temperature

In December, the average ocean temperature in Isla Vista 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

The month with the shortest days is December, with an average of 9.9h of daylight.

Sunshine

In December, the average sunshine in Isla Vista is 6.8h.

UV index

Months with the lowest UV index in Isla Vista are January through March, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for 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 Isla Vista?

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 Isla Vista, California.

What is the temperature in December in Isla Vista?

In Isla Vista, California, in December, 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 Isla Vista?

The average relative humidity in December in Isla Vista is 60%.

How much does it rain in Isla Vista in December?

In Isla Vista, California, in December, during 5.7 rainfall days, 1.34" (34mm) of precipitation is typically accumulated.

How cold is the water in December in Isla Vista?

In December, the average ocean temperature in Isla Vista 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 Isla Vista?

With an average of 9.9h of daylight, December has the shortest days of the year.

How many hours of daylight does Isla Vista have in December?

The average length of the day in December in Isla Vista is 9.9h.

How many hours of sunshine does Isla Vista have in December?

In Isla Vista, the average sunshine in December is 6.8h.

When is the lowest UV index in Isla Vista?

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

What is the UV index intensity in December in Isla Vista?

In December, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in December
Isla Vista, CA

Average temperature in December - Isla Vista, 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
Isla Vista, CA

Average pressure in December - Isla Vista, CA
  • Average pressure in December: 30.08"

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

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Average wind speed in December
Isla Vista, CA

Average wind speed in December - Isla Vista, 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
Isla Vista, CA

Average humidity in December - Isla Vista, CA
  • Average humidity in December: 60%

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

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Average rainfall in December
Isla Vista, CA

Average rainfall in December - Isla Vista, 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
Isla Vista, CA

Average rainfall days in December - Isla Vista, 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
Isla Vista, CA

Average sea temperature in December - Isla Vista, 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
Isla Vista, CA

Average daylight in December / Average sunshine in December - Isla Vista, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.8h

Months with the most sunshine are June and July (Average sunshine: 12h).
The month with the least sunshine is February (Average sunshine: 6.6h).

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Average sunshine days in December
Isla Vista, CA

Average sunshine days in December - Isla Vista, 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
Isla Vista, CA

Average UV index in December - Isla Vista, CA
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
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
Isla Vista, CA

Average cloud cover in December - Isla Vista, 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
Isla Vista, CA

Average visibility in December - Isla Vista, 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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