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December Weather in Downey, United States

Last updated: June 24, 2025

In December, the average temperature in Downey, United States hovers around -5°C (23°F). However, it can dip as low as -23°C (-9°F) and peak at a milder 10°C (51°F). Expect about 54 mm (2.1 in) of precipitation spread across 12 days, and brace yourself for high humidity levels at 91%.

December Temperature in Downey

In December in Downey, the average temperature is -5°C (23°F). The maximum can reach 10°C (51°F), while the minimum can drop to as low as -23°C (-9°F). Be sure to pack warm clothing and prepare for potentially extreme weather if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Downey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Downey, December typically has an average temperature of -5°C (23°F), with highs reaching up to 10°C (51°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec222433415163727060433322
Data source: Temperature data for Downey 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 Downey

In Downey in December, the total precipitation amount is 54 mm (2.1 in) spread over a period of 12 days.

December Precipitation Trends in Downey

The chart displays monthly precipitation patterns in Downey, 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 Downey, December typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec597850696129142235454654
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Downey

In Downey in December, humidity is 91%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and pushing you to seek warmth at every opportunity.

December Average Humidity in Downey

This chart illustrates the average monthly humidity levels in Downey, 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 Downey is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%95%90%81%71%64%59%49%52%69%86%91%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Downey

In Downey in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Downey, you can check the information here.

Maximum UV Index Levels in Downey for December

The chart shows the monthly maximum UV Index (UVI) for Downey 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 Downey typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109643
Data source: Downey 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 Downey Compares to Other Months

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

This table compares monthly weather conditions in Downey, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)59 mm (2.3 inches)95%moderate
February Weather-4°C (25°F)78 mm (3.1 inches)95%moderate
March Weather1°C (33°F)50 mm (2.0 inches)90%very high
April Weather5°C (41°F)69 mm (2.7 inches)81%very high
May Weather11°C (51°F)60 mm (2.4 inches)71%very high
June Weather17°C (63°F)29 mm (1.1 inches)64%extreme
July Weather22°C (72°F)14 mm (0.6 inches)59%extreme
August Weather21°C (70°F)22 mm (0.9 inches)49%very high
September Weather15°C (60°F)35 mm (1.4 inches)52%very high
October Weather6°C (44°F)45 mm (1.8 inches)69%high
November Weather1°C (33°F)46 mm (1.8 inches)86%moderate
December Weather-5°C (23°F)54 mm (2.1 inches)91%moderate

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