December Weather in Carlsbad, United States

Last updated: June 24, 2025

In December, the average temperature in Carlsbad, United States hovers around 10°C (51°F). Expect a temperature range that can dip to a brisk -4°C (24°F) at its lowest and warm up to a pleasant 29°C (84°F) at its peak. With an average precipitation of 25 mm (1.0 in) spread over 4 days, and humidity levels reaching 85%, be prepared for a mix of chilly and comfortable weather conditions.

December Temperature in Carlsbad

In December in Carlsbad, the average temperature is 10°C (51°F), with maximums reaching up to 29°C (84°F) and minimums dipping as low as -4°C (24°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

December Weather in Carlsbad: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Carlsbad, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Carlsbad, December typically has an average temperature of 10°C (51°F), with highs reaching up to 29°C (84°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec465060667581848477675650
Data source: Temperature data for Carlsbad generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Carlsbad

In Carlsbad in December, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

December Precipitation Trends in Carlsbad

The chart displays monthly precipitation patterns in Carlsbad, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Carlsbad, December typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec2322485110147213473512825
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Carlsbad

In Carlsbad in December, humidity is 85%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill enveloping you, making travel quite uncomfortable as your clothes cling to your skin and the air feels heavy, often leaving you longing for a dry, warmer environment.

December Average Humidity in Carlsbad

This chart illustrates the average monthly humidity levels in Carlsbad, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Carlsbad is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%74%69%70%77%76%66%60%67%72%84%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Carlsbad

In Carlsbad in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Carlsbad for better planning.

Maximum UV Index Levels in Carlsbad for December

The chart shows the monthly maximum UV Index (UVI) for Carlsbad in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Carlsbad typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121211864
Data source: Carlsbad December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Carlsbad Compares to Other Months

Weather in Carlsbad varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Carlsbad, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Carlsbad, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)23 mm (0.9 inches)74%moderate
February Weather10°C (50°F)22 mm (0.9 inches)74%high
March Weather16°C (61°F)48 mm (1.9 inches)68%very high
April Weather19°C (67°F)51 mm (2.0 inches)70%extreme
May Weather24°C (75°F)101 mm (4.0 inches)77%extreme
June Weather27°C (82°F)47 mm (1.8 inches)76%extreme
July Weather29°C (85°F)21 mm (0.8 inches)66%extreme
August Weather29°C (84°F)34 mm (1.3 inches)60%extreme
September Weather25°C (78°F)73 mm (2.9 inches)67%extreme
October Weather19°C (67°F)51 mm (2.0 inches)72%very high
November Weather13°C (56°F)28 mm (1.1 inches)83%high
December Weather10°C (51°F)25 mm (1.0 inches)85%moderate

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