With the final numbers in for June of 2012, there are a few historical expectations we can draw. Detroit was #9 for hottest Junes this year. It also tied for 5th for number of 90-degree days with 9. In the past, any June that had 9 or more 90 degree days followed with a July in the double-digits. The one exception was in 2005 when we only recorded 6. The current and forecasted upper air pattern certainly supports this farmers almanac-esque prediction for the first week of July to have many 90 degree days. See the chart below for historical figures.
Detroit 90-degree days
|Year||June 90F+||July 90F+|
The average number of 90 degree days for June is 2.5 and July is 4.6 according to temperature records that go back to 1874.