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December Weather in Rock Springs, United States

Last updated: June 24, 2025

In Rock Springs, United States, the average temperature in December hovers around -6°C (22°F), with a minimum dipping to -22°C (-7°F) and a maximum reaching 14°C (57°F). Expect about 24 mm (0.9 in) of precipitation spread across 7 days, contributing to the region's high average humidity of 90%.

December Temperature in Rock Springs

In December in Rock Springs, the average temperature is -6°C (22°F). The maximum can reach 14°C (57°F), while the minimum can drop as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and dress in layers to ensure comfort in varying conditions.

December Weather in Rock Springs: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rock Springs, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Springs, December typically has an average temperature of -6°C (22°F), with highs reaching up to 14°C (57°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec182131415165737161433321
Data source: Temperature data for Rock Springs 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 Rock Springs

In Rock Springs in December, the precipitation amount is 24 mm (0.9 in) over the course of 7 days.

December Precipitation Trends in Rock Springs

The chart displays monthly precipitation patterns in Rock Springs, 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 Rock Springs, December typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec25264039471691020242424
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rock Springs

In Rock Springs in December, humidity is 90%. With an average temperature of -6°C (22°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm while navigating through the damp, frosty air.

December Average Humidity in Rock Springs

This chart illustrates the average monthly humidity levels in Rock Springs, 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 Rock Springs is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%93%85%73%64%57%45%41%50%70%84%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rock Springs

In Rock Springs 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 Rock Springs, you can check the information here.

Maximum UV Index Levels in Rock Springs for December

The chart shows the monthly maximum UV Index (UVI) for Rock Springs 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 Rock Springs typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111212119753
Data source: Rock Springs 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 Rock Springs Compares to Other Months

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

This table compares monthly weather conditions in Rock Springs, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (19°F)25 mm (1.0 inches)92%moderate
February Weather-6°C (21°F)26 mm (1.0 inches)93%high
March Weather-1°C (31°F)40 mm (1.6 inches)85%high
April Weather5°C (41°F)39 mm (1.6 inches)73%very high
May Weather11°C (52°F)47 mm (1.9 inches)64%extreme
June Weather18°C (66°F)16 mm (0.6 inches)57%extreme
July Weather23°C (73°F)9 mm (0.4 inches)45%extreme
August Weather21°C (71°F)10 mm (0.4 inches)41%extreme
September Weather16°C (61°F)20 mm (0.8 inches)50%very high
October Weather6°C (43°F)24 mm (0.9 inches)70%high
November Weather1°C (34°F)24 mm (0.9 inches)84%moderate
December Weather-6°C (22°F)24 mm (0.9 inches)90%moderate

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