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Climate in Flagstaff, Arizona: Monthly Weather Averages

By the AverageClimate Editorial Team · Last updated: October 2026

Flagstaff sits at 7,003 feet above sea level, and its climate, as recorded at the Flagstaff Pulliam Airport, AZ station, runs to a yearly mean of 46.8°F. The warmest month is July, averaging 66.7°F with typical highs of 82.0°F; the coldest is December, averaging 30.0°F with lows around 16.9°F. Across a normal year the city receives 20.5 in of precipitation and 90.1 in of snow. The full month-by-month picture below comes from the official 1991–2020 U.S. Climate Normals — the 30-year averages the National Weather Service itself uses — so it describes the Flagstaff climate you should actually plan around, whether you are timing a visit, weighing a move, or just settling an argument about which month is best.

Flagstaff climate month by month

The table below is the complete 1991–2020 normals profile for Flagstaff: average high, average low and mean temperature, rainfall, and snowfall for every month. Read down the Mean column to feel the year's rhythm — Flagstaff's temperature range runs from 30.0°F in December to 66.7°F in July.

How to read the colors:below freezingcoldcoolmildwarmhot. Bands are colored by each cell's own temperature, so a whole year reads at a glance.

Flagstaff through the seasons

Winter in Flagstaff averages highs of 43.0–45.7°F and lows of 16.9–19.6°F, a seasonal mean of 31.0°F. The three months together bring 6.1 in of precipitation — about 30% of the city's yearly total — with February the wettest of the three at 2.17 in. Snowfall averages 58.7 in over the season, most of it in January (20.9 in). Average temperatures sit below freezing, so this is the heart of the heating season: expect snow-covered ground, icy mornings, and short, cold days as the local norm rather than the exception.

Spring in Flagstaff averages highs of 52.2–68.1°F and lows of 23.8–34.6°F, a seasonal mean of 44.3°F. The three months together bring 3.5 in of precipitation — about 17% of the city's yearly total — with March the wettest of the three at 1.88 in. Snowfall averages 21.7 in over the season, most of it in March (15.6 in). The season is a transition: the average temperature climbs 13.3°F from March to May, and by late spring Flagstaff is firmly into mild territory.

Summer in Flagstaff averages highs of 79.1–82.0°F and lows of 42.5–51.4°F, a seasonal mean of 64.1°F. The three months together bring 6.0 in of precipitation — about 29% of the city's yearly total — with August the wettest of the three at 3.04 in. It is a warm, usable summer: afternoons are hot enough for swimming and lake or coast time, while evenings usually cool off comfortably.

Fall in Flagstaff averages highs of 52.1–74.1°F and lows of 23.0–42.5°F, a seasonal mean of 47.8°F. The three months together bring 4.9 in of precipitation — about 24% of the city's yearly total — with September the wettest of the three at 1.84 in. Snowfall averages 9.7 in over the season, most of it in November (8.2 in). Temperatures ease off through the season — the monthly mean drops 20.8°F from September to November — and fall is when Flagstaff's weather turns crisp and dry, with the first freezes arriving by November.

Best and worst months to visit Flagstaff

Ranking every month by its normals — mild mean temperatures score best, heavy rain and snow count against — the most comfortable months to visit Flagstaff are:

JuneJulyAugust

June leads the list: average highs of 79.1°F, lows of 42.5°F, and 0.30 in of rain, with snow a non-factor at 0.0 in. The other picks, July and August, offer the same balance in Flagstaff's mild stretch of the year. At the other end, January is usually the month to avoid — deep-winter cold, with a mean temperature of 30.5°F and 2.05 in of precipitation plus 20.9 in of snow.

How Flagstaff compares

Across the 114 cities in our dataset, the typical city averages 57.8°F for the year and 35.7 in of precipitation. Flagstaff runs 11.0°F cooler than that typical city and drier by 15.1 in a year, ranking #104 of 114 for annual warmth and #83 of 114 for precipitation (wettest first). Its year-round temperature swing — warmest month minus coldest — is 36.7°F, which puts it in the moderate, clearly seasonal camp.

Within Arizona, Flagstaff is the coolest of the cities we track. See the Arizona climate overview for the full state comparison, including Phoenix (warmest, 75.6°F yearly mean) and Flagstaff (coolest, 46.8°F).

Planning notes for Flagstaff

For anyone relocating: average overnight lows drop below freezing in 7 months (January, February, March, April, October, November, December), so heating, winter tires, and pipe protection are real seasonal concerns; highs reach the 80s on average in 1 months, but 90°F average highs never arrive; days and nights differ by 30.0°F on average — a big desert-style swing that rewards dressing in layers year-round; 4 months of the year average between 55°F and 80°F, the band most people find comfortable without heating or cooling. Those four facts, all straight from the normals table above, shape everything from a Flagstaff wardrobe to its utility bills.

Flagstaff climate FAQ

Source: 1991–2020 U.S. Climate Normals, NOAA National Centers for Environmental Information (NCEI) — ncei.noaa.gov. Station: Flagstaff Pulliam Airport, AZ (USW00003103), elevation 7,003 ft. Figures checked October 2026.