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In Arizona, as in other regions of the world including India and Thailand, we experience a monsoon, a season of high temperatures, high winds, and high moisture, resulting in potentially deadly weather.
Up until 2008 Arizona's monsoon varied from year to year in starting date and duration. The Arizona monsoon officially began after the third consecutive day of dew points above 55 degrees. On average this occurred around July 7 with the monsoon continuing for the next two months.
Monsoon storms range from minor dust storms to violent thunderstorms. They can even spawn tornadoes, though that is very rare.