December weather - Winter 2024

Weather in December
Frequently asked questions
Average temperature in December
Average pressure in December
Average wind speed in December
Average humidity in December
Average rainfall in December
Average rainfall days in December
Average sea temperature in December
Average daylight in December
Average sunshine in December
Average sunshine days in December
Average UV index in December
Average cloud cover in December
Average visibility in December

Wood and rope barriers at sunset on the waterfront of Bayside Park in Chula Vista, San Diego Bay, California

Weather in December

As winter officially sets in, December shows a marked difference in Chula Vista's weather. Compared to the sunny summer months, the city experiences a significant drop in temperature to a moderate 63.7°F (17.6°C). Covered by slightly denser clouds, the city experiences a noticeable decline in daylight hours to 10 hr. Although rainfall increases towards December end, Chula Vista continues to entertain with its endless appeal. Commemorating the year-end, the city wraps up in holiday spirit, offering a remarkable contrast to the ebullient summer past.

Temperature

Chula Vista experiences its lowest average temperatures in December, reaching a peak of 63.7°F (17.6°C) and a minimum of 51.4°F (10.8°C).

Humidity

In Chula Vista, the average relative humidity in December is 61%.

Rainfall

In Chula Vista, during December, the rain falls for 5.3 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Chula Vista, California, during the entire year, the rain falls for 51 days and collects up to 5.63" (143mm) of precipitation.

Ocean temperature

In December, the average ocean temperature in Chula Vista is 60.4°F (15.8°C).
Note: The enjoyment of swimming decreases for most when the surface water temperature is 60.4°F (15.8°C). Breathing control becomes increasingly challenging as temperatures descend below 69.8°F (21°C).

Daylight

With an average of 10h and 0min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:33 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 4:53 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6.7h of sunshine.

UV index

The months with the lowest UV index 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 exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 4 during December translates into these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

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Frequently asked questions

What month is the coldest in Chula Vista?

Chula Vista, California, experiences its lowest temperatures in December, with an average peak of 63.7°F (17.6°C) and a low of 51.4°F (10.8°C).

What is the average December temperature in Chula Vista?

An average high-temperature, in December, in Chula Vista, is 63.7°F (17.6°C) and the average low-temperature is 51.4°F (10.8°C).

What is the average humidity in December in Chula Vista?

In Chula Vista, the average relative humidity in December is 61%.

How much does it rain in Chula Vista in December?

In December, in Chula Vista, the rain falls for 5.3 days. Throughout December, 1.06" (27mm) of precipitation is accumulated.

What is the ocean temperature in December in Chula Vista?

In Chula Vista, California, in December, the average water temperature is 60.4°F (15.8°C). For swimming, a surface water temperature of 60.4°F (15.8°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the month with the shortest days in Chula Vista?

The month with the shortest days in Chula Vista, California, is December, with an average of 10h and 0min of daylight.

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

In Chula Vista, the average day length in December is 10h and 3min.

When is the sunrise / sunset in December in Chula Vista?

On the first day of December in Chula Vista, California, sunrise is at 6:33 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 4:53 pm PST.

What is the month with the least sunshine in Chula Vista?

December has the least sunshine of the year in Chula Vista, California, with an average of 6.7h of sunshine.

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

The average sunshine duration in December in Chula Vista is 6.7h.

What are the months with the lowest UV index in Chula Vista?

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

How high is the UV index in December in Chula Vista?

In December, the average daily maximum UV index in Chula Vista is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

69.8°F 21°C

63.7°F 17.6°C

65.1°F 18.4°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6mph 9.7km/h

5.8mph 9.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

3.8

5.3

4.7

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

25.3

24.3

25.1

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Chula Vista, CA

Average high temperature in December: 63.7°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 (63.7°F).

Average low temperature in December: 51.4°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (51.1°F).

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Average pressure in December
Chula Vista, CA

Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).

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Average wind speed in December
Chula Vista, CA

Average wind speed in December: 5.3mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is October (5mph).

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Average humidity in December
Chula Vista, CA

Average humidity in December: 61%

The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (58%).

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Average rainfall in December
Chula Vista, CA

Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is February (1.1").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in December
Chula Vista, CA

Average rainfall days in December: 5.3 days

The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.7 days).

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Average sea temperature in December
Chula Vista, CA

Average sea temperature in December: 60.4°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

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Average daylight in December /
Average sunshine in December
Chula Vista, CA

Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

Average sunshine in December: 6h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in December
Chula Vista, CA

Average sunshine days in December: 24.3 days

The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in December
Chula Vista, 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
Chula Vista, CA

Average cloud cover in December: 23

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in December
Chula Vista, 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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December weather forecast
Chula Vista, CA

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