Monsoon Rainfall Totals So Far

After dry weather quelled monsoon activity for several days, moisture is back today, with a 20 to 30 percent chance of isolated thunderstorms in North Phoenix tonight and through the weekend.

So where are we on rainfall? The answer varies significantly from one neighborhood to the next, illustrating how cells of intense activity can leave bubbles of dryness in nearby communities. Check out the monsoon rainfall totals at various regional gauges so far [map of the gauges below]:

monsoon rainfall totals

Most of the gauges in and around North Phoenix don’t have long historical records, but the state climatologist, Nancy Selover, says those at Anthem North and Deer Valley Airport have each averaged about 2.85 inches over the last 30 monsoons.



There’s plenty of time for the totals to reach norms. The Arizona monsoon runs June 15 to Sept. 30. But August is typically the wettest month of this large-scale, seasonal shift in wind and weather, bringing more than an inch of rain locally. September typically contributes more than a half-inch.

Today, a “slab of maritime tropical air” is moving into the Valley from the Gulf of California, the National Weather Service said this morning. Come Monday, another drying trend begins.

monsoon storm lightning
Rain and lightning seen from Anthem during a monsoon storm in 2016. Photo: Marius Britt
rain gauge locations
Rain gauges monitored by the Maricopa County Flood Control District in the North Phoenix Area.
Robert Roy Britt
NoPho resident Robert Roy Britt has written for In&Out publications since its inception in 2005. Britt began his journalism career in New Jersey newspapers in the early 1990s. He later became a science writer and was editor-in-chief of the online media sites Space.com and Live Science. He has written four novels.
Robert Roy Britt on Email

Robert Roy Britt

NoPho resident Robert Roy Britt has written for In&Out publications since its inception in 2005. Britt began his journalism career in New Jersey newspapers in the early 1990s. He later became a science writer and was editor-in-chief of the online media sites Space.com and Live Science. He has written four novels.

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