Flagstaff weather in December
December in Flagstaff: cold, a little rain, with clean air — a good time to visit.
#11 of 12 months in Flagstaff · #592 of 897 destinations to visit in December · comfort 63/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Flagstaff in December
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Flagstaff climate normals — December
| Daytime high | 7°C / 45°F | 🧥 cold |
|---|---|---|
| Nighttime low | -2°C / 29°F | |
| Rainfall | 42 mm / 1.7 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 60% | 💧 humid |
| Dew point | -6°C / 21°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 9.8 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 21.5 cm / 8.5 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Flagstaff in December — FAQ
- Is December a good time to visit Flagstaff?
- December in Flagstaff: cold, a little rain, with clean air — a good time to visit. It ranks #11 of 12 months for Flagstaff on SeasonMap's comfort score (63/100).
- What is the weather like in Flagstaff in December?
- In December, Flagstaff averages a daily high of 7°C and a low of -1.7°C, with about 42 mm of rain over roughly 6.8 rainy days.
- What is the air quality in Flagstaff in December?
- Flagstaff has a mean US Air Quality Index of about 39 in December.
- Does it snow in Flagstaff in December?
- Flagstaff sees roughly 21.5 cm of snowfall in December.