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Climate in Arizona: Average Weather by City
Arizona spans more climate variety than most states, and its city normals prove it. The warmest city we track, Phoenix, averages 75.6°F across the year, while the coolest, Flagstaff, averages 46.8°F — a gap of 28.8°F inside one state. Rainfall runs from 7.2 in a year in Phoenix to 20.5 in in Flagstaff. This page compares every Arizona city in our dataset side by side using the same yardstick — the official NOAA 1991–2020 climate normals from each city's representative weather station — so you can pick the corner of the state that fits the weather you actually want, and the month to go see it.
Arizona cities compared
Every Arizona city in the dataset, ranked by yearly mean temperature. Click a city for its full month-by-month normals, season-by-season analysis, and best months to visit.
| City | Yearly Mean (°F) | Avg High | Avg Low | Rain (in/yr) | Snow (in/yr) | Warmest | Coldest |
|---|---|---|---|---|---|---|---|
| Phoenix | 75.6 | 87.0 | 64.1 | 7.22 | — | Jul | Dec |
| Tucson | 70.6 | 84.0 | 57.3 | 10.61 | 0.1 | Jul | Dec |
| Flagstaff | 46.8 | 61.8 | 31.8 | 20.52 | 90.1 | Jul | Dec |
Phoenix is Arizona's warm pole. Its year-round mean of 75.6°F peaks in July at 95.5°F and never drops below a 55.8°F mean in December. It collects 7.2 in of precipitation a year. For the full month-by-month profile, see the Phoenix climate page.
Flagstaff anchors the cool end. With a yearly mean of 46.8°F, a coldest month (December) averaging 30.0°F, and a warmest month that reaches only 66.7°F, it offers the state's most pronounced seasons — a swing of 36.7°F between its coldest and warmest months. Its profile is on the Flagstaff climate page.
Rain, snow, and when to visit
Rain is its own map. Flagstaff is Arizona's wettest tracked city at 20.5 in a year — 2.8 times the 7.2 in that Phoenix, the driest, receives. For snow, Flagstaff leads the state at 90.1 in a year. Anyone choosing where in Arizona to live should weigh those totals as heavily as temperature: they decide everything from flood exposure to how many grey weeks a winter holds.
When to go where: Phoenix peaks in March; Tucson peaks in April; Flagstaff peaks in June. Each city's own page ranks all twelve of its months by the same comfort score — mild mean temperatures rewarded, heavy rain and snow penalized — so the recommendation is always traceable to the normals table rather than to anyone's opinion, ours included.
Arizona climate FAQ
What is the warmest city in Arizona?
Of the Arizona cities in our dataset, Phoenix is warmest with a yearly mean of 75.6°F (1991–2020 normals); Flagstaff is coolest at 46.8°F.
What is the wettest city in Arizona?
Flagstaff averages the most precipitation, 20.52 in a year; the driest is Phoenix at 7.22 in.
Where in Arizona has the mildest climate?
By annual temperature swing, Tucson is the most even-keeled, varying just 35.2°F between its coldest and warmest months, while Phoenix swings 39.7°F.
Source: 1991–2020 U.S. Climate Normals, NOAA National Centers for Environmental Information (NCEI) — ncei.noaa.gov. One representative station per city; station names and IDs are listed on each city page. Figures checked October 2026.