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December Weather in Fillmore, United States

Last updated: June 24, 2025

In Fillmore, United States, the average temperature in December hovers around 10°C (50°F), with a minimum dipping to -1°C (30°F) and a maximum reaching up to 25°C (77°F). Expect about 63 mm (2.5 in) of precipitation over approximately 5 days, and feel the air's average humidity at a comfortable 76%.

December Temperature in Fillmore

In December in Fillmore, the average temperature is 10°C (50°F), with maximums reaching 25°C (77°F) and minimums dipping as low as -1°C (30°F). This makes it an ideal time for travelers to enjoy a range of outdoor activities, from cozy strolls to invigorating hikes.

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

The chart illustrates December temperature patterns in Fillmore, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fillmore, 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 -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec505052586169757571645750
Data source: Temperature data for Fillmore 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 Fillmore

In Fillmore in December, the precipitation amount is 63 mm (2.5 in) spread over a period of 5 days.

December Precipitation Trends in Fillmore

The chart displays monthly precipitation patterns in Fillmore, 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 Fillmore, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec79717726212224102063
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fillmore

In Fillmore 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 Fillmore

This chart illustrates the average monthly humidity levels in Fillmore, 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 Fillmore 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 Fillmore

In Fillmore 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 Fillmore for better planning.

Maximum UV Index Levels in Fillmore for December

The chart shows the monthly maximum UV Index (UVI) for Fillmore 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 Fillmore typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110754
Data source: Fillmore 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 Fillmore Compares to Other Months

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

This table compares monthly weather conditions in Fillmore, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)79 mm (3.1 inches)78%moderate
February Weather10°C (50°F)71 mm (2.8 inches)82%high
March Weather11°C (52°F)77 mm (3.0 inches)75%very high
April Weather15°C (59°F)26 mm (1.0 inches)68%very high
May Weather16°C (62°F)21 mm (0.8 inches)57%extreme
June Weather21°C (70°F)2 mm (0.1 inches)52%extreme
July Weather24°C (75°F)2 mm (0.1 inches)46%extreme
August Weather24°C (75°F)2 mm (0.1 inches)39%extreme
September Weather22°C (71°F)4 mm (0.1 inches)48%very high
October Weather18°C (64°F)9 mm (0.4 inches)59%high
November Weather14°C (57°F)20 mm (0.8 inches)72%moderate
December Weather10°C (50°F)63 mm (2.5 inches)76%moderate

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