December weather forecast
Carlsbad, CA

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The skyline and clear coastline of Carlsbad in California
The skyline and clear coastline of Carlsbad in California

Weather in December

December transitions Carlsbad into full winter mode with significantly cooler temperatures. Simultaneously, residents experience shorter daylight hours and reduced sea temperatures. With drops in overall temperatures and high relative humidity, the city prepares for the New Year. Notably, the cloud percentage climbs to 25%, marking a year-round high. Consequently, with an increased amount of rainfall at 1.97" (50mm), it heralds the wet season once more.

Temperature

December, on average, is the coldest month in Carlsbad, registering a high temperature of 62.4°F (16.9°C) and a low of 50.4°F (10.2°C).

Humidity

The average relative humidity in December is 63%.

Rainfall

The month with the most rainfall is December, when the rain falls for 6.8 days and typically aggregates up to 1.97" (50mm) of precipitation.

Ocean temperature

In Carlsbad, the average seawater temperature in December is 60.4°F (15.8°C).
Note: Swimming in 60.4°F (15.8°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).

Daylight

December has the shortest days of the year in Carlsbad, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 6:35 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:52 am and sunset at 4:52 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6.6h 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. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: An average UV index of 4 in December transforms into this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Frequently asked questions

What part of the year is the coldest in Carlsbad?

Carlsbad experiences its lowest temperatures in December, with an average peak of 62.4°F (16.9°C) and a low of 50.4°F (10.2°C).

What are the temperatures in Carlsbad in December?

During December, Carlsbad experiences an average high-temperature of 62.4°F (16.9°C) and a low-temperature of 50.4°F (10.2°C).

What is the average humidity in December in Carlsbad?

In Carlsbad, the average relative humidity in December is 63%.

What is the rainiest month in Carlsbad?

The month with the most rainfall is December, when the rain falls for 6.8 days and typically aggregates up to 1.97" (50mm) of precipitation.

How much does it rain in Carlsbad in December?

In December, in Carlsbad, California, the rain falls for 6.8 days. Throughout December, 1.97" (50mm) of precipitation is accumulated.

How cold is the water in December in Carlsbad?

In Carlsbad, in December, the average water temperature is 60.4°F (15.8°C). For most, swimming in 60.4°F (15.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the month with the shortest days in Carlsbad?

With an average of 10h and 0min of daylight, December has the shortest days of the year in Carlsbad, California.

How many hours of daylight does Carlsbad have in December?

In Carlsbad, California, the average day length in December is 10h and 0min.

What time are sunrise and sunset in December in Carlsbad?

On the first day of December in Carlsbad, California, sunrise is at 6:35 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 4:52 pm PST.

What is the month with the least sunshine in Carlsbad?

With an average of 6.6h of sunshine, December has the least sunshine of the year in Carlsbad, California.

How many hours of sunshine does Carlsbad have in December?

The average sunshine duration in December in Carlsbad, California, is 6.6h.

When is the lowest UV index in Carlsbad?

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

What is the UV index reading in December in Carlsbad?

In Carlsbad, the average daily maximum UV index in December is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Carlsbad, CA

Average temperature in December - Carlsbad, CA
  • Average high temperature in December: 62.4°F

The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in December: 50.4°F

The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).

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Average pressure in December
Carlsbad, CA

Average pressure in December - Carlsbad, 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
Carlsbad, CA

Average wind speed in December - Carlsbad, CA
  • Average wind speed in December: 5.2mph

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

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Average humidity in December
Carlsbad, CA

Average humidity in December - Carlsbad, CA
  • Average humidity in December: 63%

The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (60%).

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Average rainfall in December
Carlsbad, CA

Average rainfall in December - Carlsbad, CA
  • Average rainfall in December: 1.97"

The wettest month (with the highest rainfall) is December (1.97").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in December
Carlsbad, CA

Average rainfall days in December - Carlsbad, CA
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is March (8 days).
The month with the least rainy days is June (2.7 days).

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Average sea temperature in December
Carlsbad, CA

Average sea temperature in December - Carlsbad, CA
  • Average sea temperature in December: 60.3°F

The best month for swimming (with the highest average sea temperature) is August (68°F).
The coldest months (with the lowest average sea temperature) are January and February (58.7°F).

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

Average daylight in December / Average sunshine in December - Carlsbad, 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 months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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Average sunshine days in December
Carlsbad, CA

Average sunshine days in December - Carlsbad, CA
  • Average sunshine days in December: 22.3 days

The month with the most sunshine days is October (24.2 days).
The month with the least sunshine days is February (20 days).

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Average UV index in December
Carlsbad, CA

Average UV index in December - Carlsbad, CA
  • Average UV index in December: 4

The months with the highest UV index are 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
Carlsbad, CA

Average cloud cover in December - Carlsbad, CA
  • Average cloud cover in December: 25

The month with the most cloud cover is December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in December
Carlsbad, CA

Average visibility in December - Carlsbad, 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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Carlsbad, California, USA

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