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December Weather in Black Diamond, United States

Last updated: June 24, 2025

In December, the average temperature in Black Diamond, United States hovers around 4°C (39°F). Expect chilly days as the minimum can drop to a biting -14°C (7°F), while the maximum can reach a mild 14°C (58°F). This month also sees significant precipitation, with around 244 mm (9.6 in) spread over 20 days, contributing to an average humidity of 88%. Be prepared for a damp, cool climate!

December Temperature in Black Diamond

In December in Black Diamond, the average temperature is 4°C (39°F), with maximums reaching 14°C (58°F) and minimums dropping as low as -14°C (7°F). Be prepared for chilly temperatures and pack accordingly if you're planning to travel 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 4°C (39°F), with highs reaching up to 14°C (58°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec393742475458636458484338
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 precipitation amount is 244 mm (9.6 in) distributed over 20 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 244 mm (9.6 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec20624616014284752121105197223244
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 88%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
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 is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Black Diamond, you can visit 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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235699987532
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 Weather4°C (39°F)206 mm (8.1 inches)86%low
February Weather3°C (37°F)246 mm (9.7 inches)86%moderate
March Weather5°C (42°F)160 mm (6.3 inches)87%moderate
April Weather8°C (47°F)142 mm (5.6 inches)84%high
May Weather12°C (54°F)84 mm (3.3 inches)81%very high
June Weather15°C (59°F)75 mm (2.9 inches)82%very high
July Weather17°C (64°F)21 mm (0.8 inches)79%very high
August Weather18°C (64°F)21 mm (0.8 inches)63%very high
September Weather15°C (59°F)105 mm (4.1 inches)62%high
October Weather9°C (48°F)197 mm (7.7 inches)83%moderate
November Weather6°C (43°F)223 mm (8.8 inches)89%moderate
December Weather4°C (39°F)244 mm (9.6 inches)88%low

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