Phoenix Area Monsoon Facts

Mother Nature sure is being nice to us for the first two days of this week.  The rains have cooled off the valley and we have wonderful mid-eighties for daytime highs.  Sure the humidity has been in the sixty to mid-seventy percent range and that makes the air almost tropical feeling.  

While there have been a few storm related issues it could have been a lot worse.  This looks like it could be the last of our monsoon related moisture.  Some of these late monsoon thunderstorms can cause a lot of storm related damage.

Did you know that during our monsoon, or summer thunderstorm season, Arizona experiences more severe weather than many other states. On a very rare occasion, a severe storm may even spawn a tornado. More often, high straight line winds, dust and severe downpours resulting in flash floods are common monsoon occurrences.

Prior to 2008 the Phoenix area monsoon was considered to have started when there were three consecutive days when the dew point averaged 55 degrees or higher. However, in 2008 the National Weather Service decided to take the guesswork out of monsoon start and end dates. After all, monsoon is a season, and most people should not be concerned with whether or not a particular dust storm was defined as monsoon storm or not. Beginning in 2008, June 15 was established as the first day of monsoon, and September 30 will be the last day. Now we can be more concerned with monsoon safety and less concerned with definitions.

Meteorologists still track and report dewpoints and study monsoon weather patterns. Here are some technical monsoon facts for the Phoenix Metro area. The facts relate to dewpoint and the meteorological definition of monsoon and not the date on the calendar.

The average starting date of the monsoon in Phoenix is July 7.
The average ending date of the monsoon is September 13.
The earliest start date for the monsoon was June 16, 1925.
The latest start date for the monsoon was July 25, 1987.
The average total number of monsoon days  is 56.
The greatest number of monsoon days was 99, recorded in 1984.
The fewest number of monsoon days was 27, recorded in 1962.

The greatest number of consecutive monsoon days was 72, from June 25 through September 4, 1984. This was also the greatest number of consecutive days with dew points of 60 degrees or higher.

In Phoenix, normal rainfall during July, August and September is 2.65 inches.

The wettest monsoon occurred in 1984 when we had 9.38 inches of rain.

The driest monsoon occurred in 1924 with only 0.35 inches.

If you are looking for a fast and fair company to work with for your Air Conditioning and Heating repair or replacement needs?  Give Aaron’s Mechanical Service a call and let us help you get cooled off! Call 623-388-4436

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