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December Weather in Belle Fourche, United States

Last updated: June 24, 2025

In Belle Fourche, United States, the average temperature in December hovers around -1°C (30°F), with extremes that can plunge as low as -25°C (-13°F) or rise to a balmy 22°C (72°F). During this month, expect about 22 mm (0.8 in) of precipitation spread over 5 days, and prepare for a fairly humid atmosphere with an average humidity of 79%.

December Temperature in Belle Fourche

In December in Belle Fourche, the average temperature is -1°C (30°F), with maximums reaching 22°C (72°F) and minimums plunging as low as -25°C (-13°F). Be prepared for extreme temperature fluctuations while traveling during this time.

December Weather in Belle Fourche: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Belle Fourche, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belle Fourche, December typically has an average temperature of -1°C (30°F), with highs reaching up to 22°C (72°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec262136435569757263463730
Data source: Temperature data for Belle Fourche 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 Belle Fourche

In Belle Fourche in December, the precipitation amount is 22 mm (0.8 in) over the course of 5 days.

December Precipitation Trends in Belle Fourche

The chart displays monthly precipitation patterns in Belle Fourche, 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 Belle Fourche, December typically receives around 22 mm (0.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec142628596944603633491322
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Belle Fourche

In Belle Fourche in December, humidity is 79%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill in the air, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.

December Average Humidity in Belle Fourche

This chart illustrates the average monthly humidity levels in Belle Fourche, 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 Belle Fourche is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%70%70%76%84%85%85%77%73%74%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Belle Fourche

In Belle Fourche 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 Belle Fourche, you can visit Hourly UV Index in Belle Fourche.

Maximum UV Index Levels in Belle Fourche for December

The chart shows the monthly maximum UV Index (UVI) for Belle Fourche 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 Belle Fourche typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245991010108532
Data source: Belle Fourche 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 Belle Fourche Compares to Other Months

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

This table compares monthly weather conditions in Belle Fourche, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)14 mm (0.6 inches)77%low
February Weather-6°C (22°F)25 mm (1.0 inches)80%moderate
March Weather2°C (36°F)28 mm (1.1 inches)70%moderate
April Weather6°C (43°F)59 mm (2.3 inches)70%very high
May Weather13°C (55°F)69 mm (2.7 inches)76%very high
June Weather21°C (69°F)44 mm (1.7 inches)84%very high
July Weather24°C (75°F)60 mm (2.4 inches)85%very high
August Weather22°C (72°F)36 mm (1.4 inches)84%very high
September Weather17°C (63°F)33 mm (1.3 inches)77%very high
October Weather8°C (46°F)49 mm (1.9 inches)73%moderate
November Weather3°C (38°F)13 mm (0.5 inches)74%moderate
December Weather-1°C (30°F)22 mm (0.8 inches)79%low

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