Climate & Weather in Yuma
Yuma's climate is genuinely extreme by national standards -- the sunniest, driest, and least humid populated place in the contiguous US -- with a hot desert climate delivering mild, dry winters (the area's real draw for snowbirds) against summer heat that is more extreme on sun/dryness measures than even Phoenix.
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Learn moreRecord-setting sun and dryness
Yuma averages 4,055 of a possible 4,456 hours of sunshine per year (91%), a real world-record-cited figure, and receives only about 3 inches of rain annually -- documented as the driest and least humid populated place in the contiguous United States.
Genuinely extreme, if not the single hottest, summers
Yuma sees 175 days per year at or above 90°F -- the most of any populated place in the contiguous US -- with a July average high of 107°F and an all-time record of 124°F (1995). Phoenix still records hotter peak-summer highs on its most extreme days, but Yuma's sustained sun/heat/dryness combination is, by these measures, more extreme overall.
Mild, dry winters are the real draw behind the snowbird season
Yuma's winter climate -- mild daytime temperatures, near-constant sunshine, and very low humidity -- is the direct driver behind the area's real ~90,000-person seasonal winter-visitor population (see moving and demographics), a genuine, economically significant climate-driven demographic pattern distinct from most other markets in this dataset.
Monsoon season brings the year's real precipitation and flash-flood risk
Nearly all of Yuma's modest 3 inches of annual rainfall arrives in short, intense bursts during the June 15-September 30 monsoon window, which can produce flash flooding in washes and low-lying roads even in this extremely dry environment -- see insurance-hazard-costs for the fuller hazard picture.
Key takeaways
- Yuma is documented as the sunniest (91% of possible daylight hours), driest (~3 in./yr rainfall), and least humid populated place in the contiguous United States.
- 175 days/year at 90°F+ (the most of any populated US place), a 107°F July average high, and a 124°F record high (1995) -- though Phoenix still runs hotter on the most extreme individual days.
- Mild, dry, sunny winters are the direct driver behind Yuma's real ~90,000-person seasonal snowbird population each year.
- Nearly all of Yuma's limited annual rainfall arrives during the June 15-Sept 30 monsoon window, with real flash-flood risk despite the area's overall extreme dryness.
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