June 15th kicks off the monsoon, but we will still track those d - Tucson News Now

June 15th kicks off the monsoon, but we will still track those dew points

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Tracking dew points of 54° or higher are a thing of the past when it comes to the monsoon. But watching the dew points are an excellent way of knowing where that moisture is located and when it could arrive.

A dew point of 54° or higher was used for years, until 2008 when a flat start date for all locations was decided. June 15th to September 30th is now considered to be the monsoon. This new way is better for keeping track of average monsoon rains and it also allows all surrounding communities to be in line with each other when it comes to seasonal rainfall.

Tucson's old standard was three consecutive days of that dew point at 54° or higher while Phoenix use to use a dew point of 55° or higher. This always made Phoenix's start date later than Tucson's while the cities are only 110 miles apart.

While we are only in the middle of June, this is the time of the year we like to monitor the moisture to see if a surge of it is heading our way. Recently our dew points have not been anything to brag about but we have been above the average dew point. Below is a chart showing where our dew points have averaged daily and where we typically see them for that date.

The green line shows that magical number of 54° that we like to see for rains. We typically see that 54° average come beginning of July.

The first storms we see each year do vary by date, but typically the first rainfall for Tucson is July 3rd. While Douglas, Sierra Vista and Nogales see the first rains by the end of June. Two more weeks and we could be dealing with green on that radar and severe weather. Tucsonnewsnow.com and KOLD and Fox 11 are your stations to watch for late breaking weather.

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