Montana weather in December 2025

Expect daytime maximum temperatures of 32°F in Montana, USA in December based on long-term weather averages. There are 3 hours of sunshine per day on average, which might fall as snow.

  • 32°F maximum daytime temperature in December in Montana (Helena)32
    32°F max day temperature
  • 3 hours of sunshine per day
  • 9 days with some rainfall in December in Montana (Helena)9
    9 days with some rainfall
  • 10°F minimum night-time temperature in December in Montana (Helena)10
    10°F min night temperature
  • 9 hours of daylight per day in December in Montana (Helena)9
    9 hours of daylight per day
  • No heat & humidity in December in Montana (Helena)0
    No heat & humidity
  • 0.6 inches monthly rainfall in December in Montana (Helena)0.6
    0.6 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Montana (Helena)1
    1 (Low) UV index

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The December weather guide for Montana (Helena) 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.

Top Montana destinations

Below are average maximum temperatures at popular countries, regions and places in Montana in December. Select a holiday destination to see more weather parameters.

All Montana destinations

Metric (°C)  |  Imperial (°F)

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More about the USA

How cold is it in Montana in December?

Daytime temperatures usually reach 32°F in Helena, Montana in December, falling to 10°F at night.

How sunny is it in Montana in December?

There are normally 3 hours of bright sunshine each day in Helena, Montana in December - that's 37% of daylight hours.

Does it rain in Montana in December?

There are usually 9 days with some rain in Helena, Montana in December and the average monthly rainfall is 0.6 inches. Rain may fall as snow in this month.

Montana December sunrise & sunset times

Browse the sunrise and sunset times for Montana in December 2025. Select a month to view Montana sunrise and sunset times for the next 12 months. The Montana sunrise and sunset times shown below are for Helena.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:52 16:42
Tuesday, 16th December 2025 08:07 16:41
Wednesday, 31st December 2025 08:12 16:51

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