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December Weather in Glendora, United States

Last updated: June 24, 2025

In Glendora, United States, the average temperature in December hovers around 10°C (50°F), with a potential minimum of 0°C (33°F) and highs reaching 25°C (77°F). Expect approximately 79 mm (3.1 in) of precipitation over 5 days, accompanied by an average humidity level of 76%, creating a humid yet temperate climate.

December Temperature in Glendora

In December in Glendora, the average temperature is 10°C (50°F). Maximum temperatures can reach 25°C (77°F), while the minimum can dip as low as 0°C (33°F). This climate is ideal for travelers seeking mild weather and the opportunity to enjoy a variety of outdoor activities.

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

The chart illustrates December temperature patterns in Glendora, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glendora, December typically has an average temperature of 10°C (50°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec505052596270777773655850
Data source: Temperature data for Glendora 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 Glendora

In Glendora in December, the precipitation amount is 79 mm (3.1 in) over a span of 5 days.

December Precipitation Trends in Glendora

The chart displays monthly precipitation patterns in Glendora, 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 Glendora, December typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec777379252136106112579
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Glendora

In Glendora in December, humidity is 76%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps through your clothes, making outdoor activities quite uncomfortable and necessitating a layer of warmth for traveling.

December Average Humidity in Glendora

This chart illustrates the average monthly humidity levels in Glendora, 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 Glendora is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%82%76%68%58%52%46%39%48%59%72%76%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Glendora

In Glendora 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 Glendora for better planning.

Maximum UV Index Levels in Glendora for December

The chart shows the monthly maximum UV Index (UVI) for Glendora 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 Glendora typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
Data source: Glendora 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 Glendora Compares to Other Months

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

This table compares monthly weather conditions in Glendora, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)77 mm (3.0 inches)78%moderate
February Weather10°C (50°F)73 mm (2.9 inches)82%high
March Weather11°C (53°F)79 mm (3.1 inches)75%very high
April Weather15°C (59°F)25 mm (1.0 inches)68%very high
May Weather17°C (62°F)20 mm (0.8 inches)57%extreme
June Weather21°C (71°F)3 mm (0.1 inches)52%extreme
July Weather25°C (77°F)6 mm (0.2 inches)46%extreme
August Weather25°C (77°F)9 mm (0.4 inches)39%extreme
September Weather23°C (73°F)6 mm (0.2 inches)48%very high
October Weather18°C (65°F)11 mm (0.4 inches)59%high
November Weather14°C (58°F)25 mm (1.0 inches)72%moderate
December Weather10°C (50°F)79 mm (3.1 inches)76%moderate

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