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December Weather in South Pasadena, United States

Last updated: June 24, 2025

In South Pasadena, United States, the average temperature in December is a mild 19°C (66°F), with a comfortable minimum of 7°C (45°F) and a pleasant maximum of 25°C (77°F). Expect around 66 mm (2.6 in) of precipitation spread over 6 days, contributing to an average humidity of 84%.

December Temperature in South Pasadena

In December in South Pasadena, the average temperature is 19°C (66°F), with maximums reaching 25°C (77°F) and minimums dropping as low as 7°C (45°F). This pleasant weather makes it an ideal time for outdoor activities and exploring the local attractions.

December Weather in South Pasadena: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South Pasadena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Pasadena, December typically has an average temperature of 19°C (66°F), with highs reaching up to 25°C (77°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec626568737781828281787065
Data source: Temperature data for South Pasadena 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 South Pasadena

In South Pasadena in December, the precipitation amount is 66 mm (2.6 in) over the course of 6 days.

December Precipitation Trends in South Pasadena

The chart displays monthly precipitation patterns in South Pasadena, 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 South Pasadena, December typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec40502060105174204219143674666
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Pasadena

In South Pasadena in December, humidity is 84%. With an average temperature of 19°C (66°F), this humidity feels like a warm, sticky embrace that can make traveling uncomfortable and exhausting, as the air clings to your skin, and every step taken feels heavier in the sultry atmosphere.

December Average Humidity in South Pasadena

This chart illustrates the average monthly humidity levels in South Pasadena, 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 South Pasadena is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%82%79%78%76%75%74%75%78%80%82%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in South Pasadena

In South Pasadena in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in South Pasadena.

Maximum UV Index Levels in South Pasadena for December

The chart shows the monthly maximum UV Index (UVI) for South Pasadena 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 South Pasadena typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111112121111975
Data source: South Pasadena 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 South Pasadena Compares to Other Months

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

This table compares monthly weather conditions in South Pasadena, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)40 mm (1.6 inches)82%high
February Weather19°C (66°F)50 mm (2.0 inches)82%very high
March Weather20°C (68°F)20 mm (0.8 inches)79%very high
April Weather23°C (73°F)60 mm (2.4 inches)78%extreme
May Weather25°C (77°F)105 mm (4.1 inches)76%extreme
June Weather27°C (81°F)174 mm (6.8 inches)75%extreme
July Weather28°C (82°F)204 mm (8.0 inches)74%extreme
August Weather28°C (83°F)219 mm (8.6 inches)74%extreme
September Weather27°C (82°F)143 mm (5.6 inches)78%extreme
October Weather26°C (79°F)67 mm (2.6 inches)79%very high
November Weather21°C (70°F)46 mm (1.8 inches)82%high
December Weather19°C (66°F)66 mm (2.6 inches)84%moderate

Compare South Pasadena's Climate with Cities Worldwide