Riverton weather in December 2025

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°C maximum daytime temperature in December in Riverton-1
    -1°C max day temperature
  • 6 hours of sunshine per day
  • 6 days with some rainfall in December in Riverton6
    6 days with some rainfall
  • -15°C minimum night-time temperature in December in Riverton-15
    -15°C min night temperature
  • 9 hours of daylight per day in December in Riverton9
    9 hours of daylight per day
  • No heat & humidity in December in Riverton0
    No heat & humidity
  • 7 mm monthly rainfall in December in Riverton7
    7 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Riverton1
    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 -1°C in Riverton in December, falling to -15°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 61% 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 7mm. Rain may fall as snow in this month.

Riverton December sunrise & sunset times

Browse the sunrise and sunset times for Riverton in December 2025. Select a month to view Riverton sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:26 16:40
Tuesday, 16th December 2025 07:39 16:40
Wednesday, 31st December 2025 07:45 16:49

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