Warm, moist tropical air is needed for monsoon storms to get going over Southeast Arizona.
That is why we track the dew point numbers very closely this time of year.
When dew points are below 54°, the air is generally too dry for widespread heavy downpours.
When dew points are at or above 54° and conditions are favorable in the atmosphere for storm development, storms can form and produce heavy, flooding rain.
The Tucson National Weather Service records the dew point data throughout the monsoon.
Data is put into the record books from June 15th through September 30th.
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