Flagstaff
December
Weather in Flagstaff for December 2025
Your guide to Flagstaff weather in December - trends and predictions
With an average of 3 snowy days, Flagstaff usually enjoys a light touch of snow in December.
In general, the average temperature in Flagstaff at the beginning of December is 9.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 7.6 °F by the end of December.
Precipitation in Flagstaff during December is a rare event, with an average of fewer than 2 rainy days.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
More
28
Dry days
0
Rainy days
3
Snow days
8°/-1°
Temperatures
13 km/h
Avg max wind
47 %
Avg humidity
Flagstaff in December average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  5° | 2  8° | 3  11° | 4  10° | 5  10° | 6 12° | |
| 7 10° | 8 8° | 9 5° | 10 7° | 11 11° | 12 7° | 13 6° |
| 14 7° | 15 9° | 16 10° | 17 13° | 18 11° | 19 10° | 20 12° |
| 21 11° | 22  8° | 23 8° | 24  7° | 25 6° | 26 6° | 27 8° |
| 28 9° | 29 11° | 30 9° | 31  4° |
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Temperatures trend during December in Flagstaff
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 | Moderate or heavy snow with thunder | 5° /0° | 0.6 mm | 0.5 cm | |
| Dec. 2 | Overcast | 8° /-2° | 0 mm | 0 cm | |
| Dec. 3 | Sunny | 11° /-1° | 0 mm | 0 cm | |
| Dec. 4 | Partly cloudy | 10° /2° | 0 mm | 0 cm | |
| Dec. 5 | Cloudy | 10° /1° | 0 mm | 0 cm | |
| Dec. 6 | Partly cloudy | 12° /1° | 0 mm | 0 cm | |
| Dec. 7 | Partly cloudy | 10° /1° | 0 mm | 0 cm | |
| Dec. 8 | Sunny | 8° /-2° | 0 mm | 0 cm | |
| Dec. 9 | Sunny | 5° /-5° | 0 mm | 0 cm | |
| Dec. 10 | Sunny | 7° /-5° | 0 mm | 0 cm | |
| Dec. 11 | Overcast | 11° /-1° | 0 mm | 0 cm | |
| Dec. 12 | Partly cloudy | 7° /0° | 0 mm | 0 cm | |
| Dec. 13 | Partly cloudy | 6° /-2° | 0 mm | 0 cm | |
| Dec. 14 | Sunny | 7° /-1° | 0 mm | 0 cm | |
| Dec. 15 | Partly cloudy | 9° /-1° | 0 mm | 0 cm | |
| Dec. 16 | Sunny | 10° /-1° | 0 mm | 0 cm | |
| Dec. 17 | Sunny | 13° /3° | 0 mm | 0 cm | |
| Dec. 18 | Overcast | 11° /1° | 0 mm | 0 cm | |
| Dec. 19 | Sunny | 10° /2° | 0 mm | 0 cm | |
| Dec. 20 | Sunny | 12° /3° | 0 mm | 0 cm | |
| Dec. 21 | Partly cloudy | 11° /3° | 0 mm | 0 cm | |
| Dec. 22 | Moderate or heavy snow showers | 8° /3° | 1.3 mm | 0.5 cm | |
| Dec. 23 | Moderate or heavy snow with thunder | 8° /1° | 3.7 mm | 2.7 cm | |
| Dec. 24 | Mist | 7° /-1° | 0 mm | 0 cm | |
| Dec. 25 | Sunny | 6° /-3° | 7.2 mm | 5 cm | |
| Dec. 26 | Overcast | 6° /-2° | 0 mm | 0 cm | |
| Dec. 27 | Overcast | 8° /-1° | 0 mm | 0 cm | |
| Dec. 28 | Partly cloudy | 9° /0° | 0 mm | 0 cm | |
| Dec. 29 | Overcast | 11° /2° | 0 mm | 0 cm | |
| Dec. 30 | Overcast | 9° /0° | 0 mm | 0 cm | |
| Dec. 31 | Light snow | 4° /-2° | 0.1 mm | 0 cm | |
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Important Notice
Our weather forecast for Flagstaff in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Flagstaff forecast closer to your planned date for the most up-to-date weather information.
Flagstaff in December - FAQ
What are the expected maximum and minimum temperatures in Flagstaff during December?
Prepare for cooler days with highs just around 8° and colder nights, dipping below -1°.
How much rainfall should be expected in Flagstaff during December?
Expect minimal rainfall in Flagstaff during December, with a total of 10.9 mm over approximately 0 days. This minimal precipitation is unlikely to significantly impact plans.
Will it snow in Flagstaff in December 2025?
Flagstaff experiences an average snowfall of 6.925 cm during December, occurring over 3 days.
What are the typical wind conditions in Flagstaff during December?
The average wind speed in Flagstaff during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
Flagstaff snow forecast December 2025
Track daily snowfall levels and discover Flagstaff’s snowy potential this December ❄️
December rainfall patterns in Flagstaff
Explore the daily rainfall trends and prepare for Flagstaffs December weather 💧
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