Boise weather in December 2025

Expect daytime maximum temperatures of 3°C in Boise, Idaho in December based on long-term weather averages. There are 3 hours of sunshine per day on average with 11 days with some rainfall, which might fall as snow.

  • 3°C maximum daytime temperature in December in Boise3
    3°C max day temperature
  • 3 hours of sunshine per day
  • 11 days with some rainfall in December in Boise11
    11 days with some rainfall
  • -6°C minimum night-time temperature in December in Boise-6
    -6°C min night temperature
  • 9 hours of daylight per day in December in Boise9
    9 hours of daylight per day
  • No heat & humidity in December in Boise0
    No heat & humidity
  • 36 mm monthly rainfall in December in Boise36
    36 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Boise1
    1 (Low) UV index

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The December weather guide for Idaho (Boise) 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 Boise in December?

Daytime temperatures usually reach 3°C in Boise in December, falling to -6°C at night.

How sunny is it in Boise in December?

There are normally 3 hours of bright sunshine each day in Boise in December - that's 38% of daylight hours.

Does it rain in Boise in December?

There are usually 11 days with some rain in Boise in December and the average monthly rainfall is 36mm. Rain may fall as snow in this month.

Boise December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:59 17:09
Tuesday, 16th December 2025 08:12 17:09
Wednesday, 31st December 2025 08:18 17:18

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