Only 0.42" of rain has fallen at Phoenix Sky Harbor Airport so far this monsoon season. During the past 30 years (1979-2008), the average precipitation during that same period, June 15^th through August 10^th, was 1.22". The wettest monsoon season through August 10^th was in 1911 when 6.59" was measured while the driest was in 1995 when 0.00" of rain fell (see Top 10 tables below). The new Phoenix Rainfall Index (PRI) has measured 0.11" so far this monsoon season. The table below shows the PRI since 1999 for June 15^th through August 10^th and how it compares to observed rainfall at Phoenix Sky Harbor.

The chart below shows how, at Sky Harbor, 2009 compares to average and the wettest/driest year on record. From all of these datasets, we can easily see that the monsoon season of 2009, with a dry forecast expected through at least August 10^th, is off to a slow start. However, in 2007 the monsoon was also off to a slow start at this point (0.39").