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December Weather in Black Diamond, United States

Last updated: June 24, 2025

In Black Diamond, United States, the average temperature in December hovers around 16°C (62°F). Prepare for a range of conditions, with minimums dipping to -1°C (30°F) and maximums reaching 29°C (84°F). Expect 86 mm (3.4 in) of precipitation over approximately 7 days, accompanied by an average humidity level of 86%.

December Temperature in Black Diamond

In December in Black Diamond, the average temperature is 16°C (62°F). Maximums can reach 29°C (84°F), while minimums can drop as low as -1°C (30°F). Therefore, travelers should be prepared for a wide range of weather conditions during this time.

December Weather in Black Diamond: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Black Diamond, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Black Diamond, December typically has an average temperature of 16°C (62°F), with highs reaching up to 29°C (84°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec586467727781818281776661
Data source: Temperature data for Black Diamond 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 Black Diamond

In Black Diamond in December, the total precipitation amount is 86 mm (3.4 in) over a span of 7 days.

December Precipitation Trends in Black Diamond

The chart displays monthly precipitation patterns in Black Diamond, 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 Black Diamond, December typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec47602592109173217209149824786
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Black Diamond

In Black Diamond in December humidity is 86%. With an average temperature of 16°C (62°F), this humidity feels like a muggy embrace that can make traveling slightly uncomfortable, as the stickiness clings to your skin and the air seems thick, enticing you to seek shade and refreshment more often.

December Average Humidity in Black Diamond

This chart illustrates the average monthly humidity levels in Black Diamond, 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 Black Diamond is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%78%77%75%76%79%78%83%81%83%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Black Diamond

In Black Diamond in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Black Diamond.

Maximum UV Index Levels in Black Diamond for December

The chart shows the monthly maximum UV Index (UVI) for Black Diamond 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 Black Diamond typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112111110975
Data source: Black Diamond 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 Black Diamond Compares to Other Months

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

This table compares monthly weather conditions in Black Diamond, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)47 mm (1.9 inches)83%moderate
February Weather18°C (65°F)60 mm (2.4 inches)82%very high
March Weather19°C (67°F)25 mm (1.0 inches)78%very high
April Weather22°C (72°F)92 mm (3.6 inches)77%extreme
May Weather25°C (78°F)109 mm (4.3 inches)75%extreme
June Weather27°C (81°F)172 mm (6.8 inches)76%extreme
July Weather27°C (82°F)217 mm (8.5 inches)79%extreme
August Weather28°C (82°F)209 mm (8.2 inches)78%extreme
September Weather27°C (81°F)149 mm (5.8 inches)83%very high
October Weather25°C (77°F)82 mm (3.2 inches)81%very high
November Weather19°C (67°F)47 mm (1.8 inches)83%high
December Weather16°C (62°F)86 mm (3.4 inches)86%moderate

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