It's the HEAT! July 2011 goes out in a blaze of heat!

First off, even though I added it as a comment to my July write-up, it bears repeating here if you didn't see it.  It was one MISERABLE July for those who hate heat and humidity.  Yes, it did turn out to be the hottest July and worse yet, hottest MONTH on record at Detroit!  Add the relatively high humidity levels that accompanied the heat and that made it downright miserable much of the time. The only thing worse than July's heat and humidity, will be August's electric bill (and I'm scared of that)!

Take a look the Temperature Departure map across the Midwest for this
July, which is normally the hottest month anyway!

Second, July was also a "precipitation extreme month" with very wet and dry conditions existing in unison. Parts of the area saw less than .50" of rain up until very heavy rains from storms hit the entire region very late in the month. These heavy rains camouflaged (on July's rainfall map) the intense dry spell that engulfed some of the region from late June into late July that led to parched lawns and gardens.  Not so at Detroit Metro Airport (Detroit's official climate site) and nearby downriver communities, they got hammered with most of the storm activity through the month. This led to the second wettest July on record at Detroit with 7.66" (second only to 1878 with 8.76").  Curiously, this is not unlike last summer when much of the severe weather and heavy rains also fell south of I-94.  The driest areas this July (before the late month heavy rains) extended from northern Washtenaw and Wayne counties, north into Brighton, Saginaw and Flint and eastward into the interior of the Thumb Region.
    A better defined rainfall map >>>>

Recapping the July Stats:
Average temp for Detroit in July 2011 was 79.3 degrees and this makes July 2011 the hottest July and MONTH on record.  Also, July had 14 days it reached 90 degrees or better but this was NOT the record for July. That honor belongs to July of 1955 with 17 days of 90 or better. We now have a three-way tie for second place for the number of 90s+ in July with 14 days with July 2011 tying with July of 1977 and 1934. This July we maxed out at 100 degrees on the 21st (let's not forget the 99 on the 2nd). By the way, back in that July of 1977 we had a monthly max of 102 (one of two 100s in the month). That Summer of '77 was preceded by the brutal winter of 1976-77 and the following Winter of 1977-78 was non too pleasant, either.

How did we place in the hottest months across the region?

Detroit July Ave:    79.3 - Hottest July/month on record
Flint July Ave:        76.8 - Third hottest July/month on record
Saginaw July Ave: 76.1 - Fourth hottest July/month on record

Previous top 5 Hottest Months on Record from NWS

Rank Detroit Area* Flint Bishop** Saginaw Area***
Coldest Warmest Coldest Warmest Coldest Warmest
Temp Year Temp Year Temp Year Temp Year Temp Year Temp Year
1 12.2 Feb-1875 79.0 Jul-1955 10.9 Jan-1977 78.0 Jul-1921 9.4 Jan-1912 77.5 Jul-1921
2 12.8 Jan-1977 79.0 Jul-1921 12.8 Feb-1979 77.7 Jul-1935 10.4 Jan-1918 76.8 Jul-1916
3 13.1 Jan-1912 77.9 Jul-1916 13.1 Jan-1963 76.7 Jul-1934 11.6 Jan-1963 76.2 Jul-1935
4 13.2 Jan-1918 77.7 Jul-1931 13.4 Feb-1978 76.5 Jul-1955 11.7 Feb-1904 76.0 Jul-1931
5 14.8 Feb-1934 77.1 Aug-1995 13.8 Jan-1994 76.1 Jul-1931 12.1 Jan-1994 75.9 Jul-1955

Finally, a  cooling trend in the offing??? We'll look at what the extended maps are hinting at for the rest of the summer, in a couple of days.

How the July heat affected the rest of the country

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