December Weather in Riverton, United States

Last updated: June 24, 2025

In Riverton, United States, the average temperature in December hovers around -2°C (29°F), with extremes ranging from a chilly -17°C (2°F) to a milder 15°C (59°F). Expect 43 mm (1.7 in) of precipitation spread over 10 days, contributing to an average humidity of 88%. Be prepared for a cold and wet climate!

December Temperature in Riverton

In December in Riverton, the average temperature is -2°C (29°F). The maximum can reach 15°C (59°F), while the minimum can drop as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures, layering clothing accordingly to stay comfortable during their visit.

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 (29°F), with highs reaching up to 15°C (59°F) and lows dropping to around -17°C (2°F).

Data source: Temperature data for Riverton generated using information from the Copernicus Climate Change Service.

December Precipitation in Riverton

In Riverton in December, the precipitation amount is 43 mm (1.7 in) over a span of 10 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 43 mm (1.7 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Riverton

In Riverton in December, humidity is 88%. With an average temperature of -2°C (29°F), this humidity feels like a biting chill in the air that penetrates layers of clothing, making outdoor activities challenging and potentially uncomfortable for travelers.

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 88%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	50 mm (2.0 inches)	91%	moderate
February Weather	0°C (32°F)	58 mm (2.3 inches)	92%	high
March Weather	5°C (41°F)	64 mm (2.5 inches)	84%	high
April Weather	9°C (49°F)	60 mm (2.3 inches)	74%	very high
May Weather	15°C (59°F)	44 mm (1.7 inches)	62%	extreme
June Weather	22°C (73°F)	12 mm (0.5 inches)	56%	extreme
July Weather	27°C (81°F)	10 mm (0.4 inches)	44%	extreme
August Weather	26°C (78°F)	18 mm (0.7 inches)	37%	extreme
September Weather	20°C (68°F)	31 mm (1.2 inches)	46%	very high
October Weather	10°C (51°F)	36 mm (1.4 inches)	67%	high
November Weather	5°C (41°F)	30 mm (1.2 inches)	84%	moderate
December Weather	-2°C (29°F)	43 mm (1.7 inches)	88%	moderate