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December Weather in South Pasadena, United States

Last updated: June 24, 2025

The average temperature in South Pasadena, United States during December is a mild 13°C (57°F). Expect temperatures to range from a cool 3°C (38°F) at night to a warm 28°C (83°F) during the day. Be prepared for some rain, as the area receives about 76 mm (3.0 in) of precipitation over 5 days, and enjoy the comfortable 71% average humidity that adds to the region's charm.

December Temperature in South Pasadena

In December in South Pasadena, the average temperature is 13°C (57°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop to as low as 3°C (38°F). Pack accordingly to enjoy a comfortable and pleasant trip!

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 13°C (57°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec565759646570757674706356
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 76 mm (3.0 in) over a duration of 5 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 76 mm (3.0 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec7155701912322381876
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 71%. With an average temperature of 13°C (57°F), this humidity feels like a damp, chilly embrace that can make outdoor activities somewhat uncomfortable for traveling.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
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 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 South Pasadena for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891011111010754
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 Weather13°C (57°F)71 mm (2.8 inches)74%moderate
February Weather14°C (57°F)55 mm (2.2 inches)79%high
March Weather15°C (59°F)70 mm (2.8 inches)75%very high
April Weather18°C (64°F)19 mm (0.7 inches)70%very high
May Weather19°C (66°F)12 mm (0.5 inches)70%very high
June Weather21°C (70°F)3 mm (0.1 inches)72%extreme
July Weather24°C (75°F)2 mm (0.1 inches)73%extreme
August Weather24°C (76°F)2 mm (0.1 inches)69%very high
September Weather23°C (74°F)3 mm (0.1 inches)68%very high
October Weather21°C (70°F)8 mm (0.3 inches)67%high
November Weather17°C (63°F)17 mm (0.7 inches)68%moderate
December Weather13°C (57°F)76 mm (3.0 inches)71%moderate

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