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December Weather in Copperopolis, United States

Last updated: June 24, 2025

In December, the average temperature in Copperopolis, United States is a crisp 9°C (48°F). Temperatures can dip to a chilly -1°C (30°F) at their lowest, while highs may reach a pleasant 22°C (73°F). Expect about 123 mm (4.8 in) of precipitation over 9 days, contributing to an average humidity of 80%—perfect for cozy indoor activities!

December Temperature in Copperopolis

In December in Copperopolis, the average temperature is 9°C (48°F). The maximum can reach 22°C (73°F), and the minimum can be as low as -1°C (30°F). Be prepared for a range of temperatures to make the most of your travels during this time.

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

The chart illustrates December temperature patterns in Copperopolis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Copperopolis, December typically has an average temperature of 9°C (48°F), with highs reaching up to 22°C (73°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec485054606674787773635448
Data source: Temperature data for Copperopolis 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 Copperopolis

In Copperopolis in December, the precipitation amount is 123 mm (4.8 in) over the course of 9 days.

December Precipitation Trends in Copperopolis

The chart displays monthly precipitation patterns in Copperopolis, 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 Copperopolis, December typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec141133145663820043768123
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Copperopolis

In Copperopolis in December humidity is 80%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel quite uncomfortable.

December Average Humidity in Copperopolis

This chart illustrates the average monthly humidity levels in Copperopolis, 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 Copperopolis is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Copperopolis

In Copperopolis 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 Copperopolis, you can check the information here.

Maximum UV Index Levels in Copperopolis for December

The chart shows the monthly maximum UV Index (UVI) for Copperopolis 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 Copperopolis typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3588101111109643
Data source: Copperopolis 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 Copperopolis Compares to Other Months

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

This table compares monthly weather conditions in Copperopolis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)141 mm (5.6 inches)82%moderate
February Weather10°C (50°F)133 mm (5.2 inches)84%moderate
March Weather12°C (54°F)145 mm (5.7 inches)82%very high
April Weather15°C (60°F)65 mm (2.6 inches)78%very high
May Weather19°C (66°F)38 mm (1.5 inches)71%very high
June Weather23°C (74°F)2 mm (0.1 inches)64%extreme
July Weather26°C (78°F)0 mm (0.0 inches)58%extreme
August Weather25°C (78°F)0 mm (0.0 inches)54%very high
September Weather23°C (73°F)4 mm (0.2 inches)55%very high
October Weather17°C (64°F)36 mm (1.4 inches)62%high
November Weather12°C (54°F)68 mm (2.7 inches)78%moderate
December Weather9°C (48°F)123 mm (4.8 inches)80%moderate

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