Climate & Weather in Flagstaff
Flagstaff has a genuine four-season, high-elevation mountain climate -- 7,003 feet, winter daytime highs averaging 45°F, summer highs around a comfortable 80°F, and real annual snowfall of 97-101.7 inches -- almost entirely unlike the Phoenix/Tucson desert valley documented elsewhere in this dataset.
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Learn moreA genuinely cooler, four-season climate than the rest of Arizona
At 7,003 feet elevation, Flagstaff runs 20-25°F cooler than Phoenix on a comparable summer day, with summer daytime highs averaging a comfortable 80°F rather than Phoenix's 100°F+ extremes. Winters are real, not nominal: daytime highs average 45°F, and the city sees genuine snow accumulation most winters.
Real, substantial annual snowfall
Flagstaff's average annual snowfall is cited at 97 inches by one source and 101.7 inches by a separate 1981-2010 NOAA-normal-period source -- both real, current figures placing Flagstaff among the snowiest cities in Arizona, not a marginal dusting.
Monsoon season brings the same statewide flash-flood window, with a local wrinkle
Like the rest of Arizona, Flagstaff sits within the June 15-September 30 North American Monsoon window (see arizona.js), but with a Flagstaff-specific compounding factor: monsoon storms hitting recent wildfire burn scars (Schultz, Museum, Tunnel, Pipeline) produce a materially elevated flash-flood and debris-flow risk beyond the general statewide monsoon pattern -- see insurance-hazard-costs.
Not the extreme-heat public-health hazard documented for Phoenix
Unlike Phoenix and Tucson in this dataset, Flagstaff's summer climate does not carry a comparable extreme-heat public-health burden -- the real, distinct hazards here are winter snow/ice and wildfire/post-fire flooding instead, a genuinely different risk profile worth understanding on its own terms rather than assuming 'Arizona is hot' applies uniformly.
Key takeaways
- Flagstaff sits at 7,003 feet with a genuine four-season climate: winter daytime highs averaging 45°F, summer highs around 80°F -- 20-25°F cooler than Phoenix in summer.
- Average annual snowfall runs 97-101.7 inches depending on measurement period, among the highest of any Arizona city.
- Flagstaff shares Arizona's June 15-September 30 monsoon window, with a local compounding risk: storms hitting recent wildfire burn scars produce elevated flash-flood/debris-flow risk beyond the general statewide pattern.
- Flagstaff does not share Phoenix's extreme-heat public-health hazard -- its real, distinct hazards are winter snow/ice and wildfire/post-fire flooding instead.
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