Mammoth Lakes weather in December 2025

Expect 4°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Mammoth Lakes in December based on long-term weather averages. There is usually 6 days with some rainfall and 119 mm of average monthly rainfall in December.

  • 4°C maximum daytime temperature in December in Mammoth Lakes4
    4°C max day temperature
  • 6 hours of sunshine per day
  • 6 days with some rainfall in December in Mammoth Lakes6
    6 days with some rainfall
  • -9°C minimum night-time temperature in December in Mammoth Lakes-9
    -9°C min night temperature
  • 10 hours of daylight per day in December in Mammoth Lakes10
    10 hours of daylight per day
  • No heat & humidity in December in Mammoth Lakes0
    No heat & humidity
  • 119 mm monthly rainfall in December in Mammoth Lakes119
    119 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in December in Mammoth Lakes2
    2 (Low) UV index

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The December weather guide for California (Mammoth Lakes) 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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More about California

How cold is it in Mammoth Lakes in December?

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

How sunny is it in Mammoth Lakes in December?

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

Does it rain in Mammoth Lakes in December?

There are usually 6 days with some rain in Mammoth Lakes in December and the average monthly rainfall is 119mm. Rain may fall as snow in this month.

Mammoth Lakes December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 06:53 16:38
Tuesday, 16th December 2025 07:05 16:39
Wednesday, 31st December 2025 07:11 16:48

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