Overall on the next 14 days there will be 2 days with snow in Flagstaff and a total of 1.7 cm of snow.
It will be snowy on the following days:
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Flagstaff 
Weather in December 2025
Overall on the next 14 days there will be 2 days with snow in Flagstaff and a total of 1.7 cm of snow.
It will be snowy on the following days:
The weather in Flagstaff in December is very cold with temperatures between -3°C and 6°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Flagstaff during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Flagstaff is going to experience quite a number of days of snow during December. It’s the perfect time to build snowmen, drink hot cocoa, and have a snowball fight. Just remember to wear a warm scarf and a pair of mittens!
Our weather forecast can give you a great sense of what weather to expect in Flagstaff in December 2025.
If you’re planning to visit Flagstaff in the near future, we highly recommend that you review the 14 day weather forecast for Flagstaff before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / -3° | 3 | 20 | 8 | 49 mm | Awful | Flagstaff in January |
| February | 7° / -2° | 2 | 19 | 7 | 47 mm | Bad | Flagstaff in February |
| March | 11° / 1° | 2 | 23 | 6 | 43 mm | Bad | Flagstaff in March |
| April | 16° / 4° | 2 | 25 | 3 | 22 mm | Ok | Flagstaff in April |
| May | 20° / 7° | 3 | 27 | 1 | 24 mm | Good | Flagstaff in May |
| June | 27° / 13° | 1 | 29 | 0 | 15 mm | Perfect | Flagstaff in June |
| July | 28° / 16° | 9 | 22 | 0 | 178 mm | Good | Flagstaff in July |
| August | 27° / 16° | 6 | 25 | 0 | 127 mm | Perfect | Flagstaff in August |
| September | 24° / 13° | 4 | 26 | 0 | 56 mm | Perfect | Flagstaff in September |
| October | 18° / 6° | 3 | 28 | 1 | 30 mm | Good | Flagstaff in October |
| November | 12° / 1° | 2 | 25 | 4 | 36 mm | Bad | Flagstaff in November |
| December | 6° / -3° | 3 | 19 | 9 | 57 mm | Awful | Flagstaff in December |
