December weather forecast and climate
Chula Vista, CA

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

Weather in December

The first month of the winter, December, is still a comfortable month in Chula Vista, California, with average temperature ranging between min 51.4°F (10.8°C) and max 63.7°F (17.6°C).

Temperature

With an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 51.4°F (10.8°C), December is the coldest month.

Humidity

In December, the average relative humidity is 61%.

Rainfall

In Chula Vista, California, during December, the rain falls for 5.3 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, in Chula Vista, California, there are 51 rainfall days, and 5.63" (143mm) of precipitation is accumulated.

Ocean temperature

In December, the average ocean temperature in Chula Vista is 60.4°F (15.8°C).
Note: Swimming in 60.4°F (15.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

December has the shortest days of the year in Chula Vista, with an average of 10h of daylight.

Sunshine

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

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Chula Vista. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Chula Vista?

The coldest month is December, with an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 51.4°F (10.8°C).

What is the temperature in December in Chula Vista?

In December, the average high-temperature 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?

The average relative humidity in December in Chula Vista, California, is 61%.

How many days does it rain in December in Chula Vista?

In December, in Chula Vista, California, 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, the average seawater temperature in December is 60.4°F (15.8°C). Swimming in 60.4°F (15.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

With an average of 10h of daylight, December has the shortest days of the year in Chula Vista.

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

In Chula Vista, the average length of the day in December is 10h.

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

The month with the least sunshine in Chula Vista is December, with an average of 6.7h of sunshine.

How long on average sun shines in December in Chula Vista?

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

What is the month with the lowest UV index in Chula Vista?

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

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

In Chula Vista, the average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in December
Chula Vista, CA

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 - Chula Vista, CA
  • Average pressure in December: 30.06"

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

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Average wind speed in December
Chula Vista, CA

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 - 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 - 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 - 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 - 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 / Average sunshine in December - Chula Vista, CA
  • Average daylight in December: 10h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 6.7h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in December
Chula Vista, CA

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 - Chula 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
Chula Vista, CA

Average cloud cover in December - Chula Vista, CA
  • Average cloud cover in December: 23

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 - Chula 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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