Riverton weather in December 2026

Q: How cold is it in Riverton in December?

Daytime temperatures usually reach 4°C in Riverton in December, falling to -9°C at night.

Q: How sunny is it in Riverton in December?

There are normally 6 hours of bright sunshine each day in Riverton in December - that's 62% of daylight hours.

Q: Does it rain in Riverton in December?

There are usually 6 days with some rain in Riverton in December and the average monthly rainfall is 10mm. Rain may fall as snow in this month.

Expect daytime maximum temperatures of -1°C in Riverton, Wyoming in December based on long-term weather averages. There are 6 hours of sunshine per day on average, which might fall as snow.

-1
-1°C max day temperature
6
6 hours of sunshine per day
6
6 days with some rainfall
-15
-15°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
7
7 mm of monthly rainfall
1
1 (Low) UV index

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The December weather guide for Wyoming (Riverton) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

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How cold is it in Riverton in December?

Daytime temperatures usually reach 4°C in Riverton in December, falling to -9°C at night.

How sunny is it in Riverton in December?

There are normally 6 hours of bright sunshine each day in Riverton in December - that's 62% of daylight hours.

Does it rain in Riverton in December?

There are usually 6 days with some rain in Riverton in December and the average monthly rainfall is 10mm. Rain may fall as snow in this month.