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December Weather in Vernal, United States

Last updated: June 24, 2025

In Vernal, United States, the average temperature in December hovers around -4°C (25°F). While you might encounter chilling lows of -21°C (-5°F), the mercury can rise to a mild 12°C (55°F). Expect 28 mm (1.1 in) of precipitation over about 6 days, contributing to a notably high average humidity of 90%.

December Temperature in Vernal

In December in Vernal, the average temperature is -4°C (25°F). The maximum can reach 12°C (55°F) and the minimum can be as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.

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

The chart illustrates December temperature patterns in Vernal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vernal, December typically has an average temperature of -4°C (25°F), with highs reaching up to 12°C (55°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec202536465770767364463725
Data source: Temperature data for Vernal 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 Vernal

In Vernal in December, the precipitation amount is 28 mm (1.1 in) over the course of 6 days.

December Precipitation Trends in Vernal

The chart displays monthly precipitation patterns in Vernal, 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 Vernal, December typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec263840313317111819352328
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Vernal

In Vernal in December humidity is 90%. With an average temperature of -4°C (25°F), this humidity feels like a dense, icy blanket wrapping around you, making travel feel particularly stifling in the cold despite the sub-zero temperatures.

December Average Humidity in Vernal

This chart illustrates the average monthly humidity levels in Vernal, 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 Vernal 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 Vernal

In Vernal 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 Vernal, you can check the information here.

Maximum UV Index Levels in Vernal for December

The chart shows the monthly maximum UV Index (UVI) for Vernal 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 Vernal typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec368101112121110753
Data source: Vernal 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 Vernal Compares to Other Months

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

This table compares monthly weather conditions in Vernal, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)26 mm (1.0 inches)92%moderate
February Weather-4°C (25°F)38 mm (1.5 inches)93%high
March Weather2°C (37°F)40 mm (1.6 inches)85%very high
April Weather8°C (46°F)31 mm (1.2 inches)73%very high
May Weather14°C (57°F)33 mm (1.3 inches)64%extreme
June Weather21°C (70°F)17 mm (0.7 inches)57%extreme
July Weather25°C (77°F)11 mm (0.4 inches)45%extreme
August Weather23°C (73°F)18 mm (0.7 inches)41%extreme
September Weather18°C (64°F)19 mm (0.8 inches)50%very high
October Weather8°C (46°F)35 mm (1.4 inches)70%high
November Weather3°C (37°F)22 mm (0.9 inches)84%moderate
December Weather-4°C (25°F)28 mm (1.1 inches)90%moderate

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