Sun Valley weather in December 2025

Expect daytime maximum temperatures of -1°C in Sun Valley, Idaho in December based on long-term weather averages. There are 4 hours of sunshine per day on average with 13 days with some rainfall and typically 67 mm of rainfall in the month, which might fall as snow.

  • -1°C maximum daytime temperature in December in Sun Valley-1
    -1°C max day temperature
  • 4 hours of sunshine per day
  • 13 days with some rainfall in December in Sun Valley13
    13 days with some rainfall
  • -13°C minimum night-time temperature in December in Sun Valley-13
    -13°C min night temperature
  • 9 hours of daylight per day in December in Sun Valley9
    9 hours of daylight per day
  • No heat & humidity in December in Sun Valley0
    No heat & humidity
  • 67 mm monthly rainfall in December in Sun Valley67
    67 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Sun Valley1
    1 (Low) UV index

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The December weather guide for Idaho (Sun Valley) 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 Sun Valley in December?

Daytime temperatures usually reach -1°C in Sun Valley in December, falling to -13°C at night.

How sunny is it in Sun Valley in December?

There are normally 4 hours of bright sunshine each day in Sun Valley in December - that's 40% of daylight hours.

Does it rain in Sun Valley in December?

There are usually 13 days with some rain in Sun Valley in December and the average monthly rainfall is 67mm. Rain may fall as snow in this month.

Sun Valley December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:52 17:01
Tuesday, 16th December 2025 08:05 17:01
Wednesday, 31st December 2025 08:11 17:10

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