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December Weather in Hysham, United States

Last updated: June 24, 2025

In Hysham, United States, the average temperature in December hovers around -2°C (29°F), but don't let that fool you; it can swing dramatically from a chilling -29°C (-21°F) to a surprisingly warm 21°C (70°F). Expect about 24 mm (1.0 in) of precipitation over approximately 6 days, with an overall average humidity of 84%. Embrace the eclectic weather as you explore this fascinating destination!

December Temperature in Hysham

In December in Hysham, the average temperature is -2°C (29°F). The maximum can reach 21°C (70°F), while the minimum can drop as low as -29°C (-21°F). Be prepared for significant temperature fluctuations if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Hysham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hysham, December typically has an average temperature of -2°C (29°F), with highs reaching up to 21°C (70°F) and lows dropping to around -29°C (-21°F).
JanFebMarAprMayJunJulAugSepOctNovDec241934445668777463463628
Data source: Temperature data for Hysham 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 Hysham

In Hysham in December, the precipitation amount is 24 mm (1.0 in) spread over a period of 6 days.

December Precipitation Trends in Hysham

The chart displays monthly precipitation patterns in Hysham, 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 Hysham, December typically receives around 24 mm (1.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec173430545158262143342324
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hysham

In Hysham in December, humidity is 84%. With an average temperature of -2°C (29°F), this humidity feels like an icy blanket that clings to your skin, making it difficult to stay warm and comfortable while traveling.

December Average Humidity in Hysham

This chart illustrates the average monthly humidity levels in Hysham, 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 Hysham is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%76%70%76%78%78%73%67%68%77%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hysham

In Hysham 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 Hysham, you can visit Hourly UV Index in Hysham.

Maximum UV Index Levels in Hysham for December

The chart shows the monthly maximum UV Index (UVI) for Hysham 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 Hysham typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24599101098532
Data source: Hysham 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 Hysham Compares to Other Months

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

This table compares monthly weather conditions in Hysham, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)17 mm (0.7 inches)80%low
February Weather-7°C (19°F)33 mm (1.3 inches)83%moderate
March Weather1°C (35°F)30 mm (1.2 inches)75%moderate
April Weather7°C (44°F)54 mm (2.1 inches)70%very high
May Weather13°C (57°F)51 mm (2.0 inches)76%very high
June Weather20°C (69°F)58 mm (2.3 inches)78%very high
July Weather25°C (77°F)26 mm (1.0 inches)78%very high
August Weather23°C (74°F)21 mm (0.8 inches)73%very high
September Weather17°C (63°F)43 mm (1.7 inches)67%very high
October Weather8°C (46°F)34 mm (1.3 inches)68%moderate
November Weather2°C (37°F)23 mm (0.9 inches)77%moderate
December Weather-2°C (29°F)24 mm (1.0 inches)84%low

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