Flagstaff weather in December 2025

Expect daytime maximum temperatures of 43°F in Flagstaff, Arizona in December based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 2.1 inches of rainfall in the month, which might fall as snow.

  • 43°F maximum daytime temperature in December in Flagstaff43
    43°F max day temperature
  • 7 hours of sunshine per day
  • 6 days with some rainfall in December in Flagstaff6
    6 days with some rainfall
  • 12°F minimum night-time temperature in December in Flagstaff12
    12°F min night temperature
  • 10 hours of daylight per day in December in Flagstaff10
    10 hours of daylight per day
  • No heat & humidity in December in Flagstaff0
    No heat & humidity
  • 2.1 inches monthly rainfall in December in Flagstaff2.1
    2.1 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in December in Flagstaff3
    3 (Moderate) UV index

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The December weather guide for Arizona (Flagstaff) 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)  |  Imperial (°F)

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More about Arizona

How cold is it in Flagstaff in December?

Daytime temperatures usually reach 43°F in Flagstaff in December, falling to 12°F at night.

How sunny is it in Flagstaff in December?

There are normally 7 hours of bright sunshine each day in Flagstaff in December - that's 72% of daylight hours.

Does it rain in Flagstaff in December?

There are usually 6 days with some rain in Flagstaff in December and the average monthly rainfall is 2.1 inches. Rain may fall as snow in this month.

Flagstaff December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:17 17:14
Tuesday, 16th December 2025 07:29 17:16
Wednesday, 31st December 2025 07:35 17:25

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