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December Weather in Riverton, United States

Last updated: June 24, 2025

In December, the average temperature in Riverton, United States hovers around 2°C (36°F), with minimums dipping to a chilly -19°C (-2°F) and maximums rising to a pleasant 19°C (67°F). Expect 51 mm (2.0 in) of precipitation spread over about 7 days, and keep in mind the high humidity level of 87% that can make the air feel quite cool.

December Temperature in Riverton

In December in Riverton, the average temperature is 2°C (36°F), with maximums reaching 19°C (67°F) and minimums dipping down to -19°C (-2°F). This wide range of temperatures means travelers should be prepared for a mix of chilly weather and warmer days, which adds an adventurous element to exploring the area.

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

The chart illustrates December temperature patterns in Riverton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverton, December typically has an average temperature of 2°C (36°F), with highs reaching up to 19°C (67°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec293244536575777471574236
Data source: Temperature data for Riverton 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 Riverton

In Riverton in December, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.

December Precipitation Trends in Riverton

The chart displays monthly precipitation patterns in Riverton, 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 Riverton, December typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec697113313014411911288591047051
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Riverton

In Riverton in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

December Average Humidity in Riverton

This chart illustrates the average monthly humidity levels in Riverton, 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 Riverton is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Riverton

In Riverton 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 Riverton, you can check the information here.

Maximum UV Index Levels in Riverton for December

The chart shows the monthly maximum UV Index (UVI) for Riverton 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 Riverton typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111198643
Data source: Riverton 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 Riverton Compares to Other Months

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

This table compares monthly weather conditions in Riverton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)69 mm (2.7 inches)84%moderate
February Weather0°C (32°F)71 mm (2.8 inches)82%moderate
March Weather6°C (44°F)133 mm (5.2 inches)84%high
April Weather11°C (53°F)130 mm (5.1 inches)83%very high
May Weather19°C (66°F)144 mm (5.7 inches)80%very high
June Weather24°C (75°F)119 mm (4.7 inches)83%extreme
July Weather25°C (78°F)112 mm (4.4 inches)82%extreme
August Weather23°C (75°F)88 mm (3.5 inches)82%very high
September Weather22°C (71°F)59 mm (2.3 inches)79%very high
October Weather14°C (58°F)104 mm (4.1 inches)79%high
November Weather5°C (42°F)70 mm (2.8 inches)88%moderate
December Weather2°C (36°F)51 mm (2.0 inches)87%moderate

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