July 2011 was the warmest month on record for Detroit. The average temperature for July 2011 was 79.3 degrees. The previous record for July and the warmest month all time was 79.0 degrees set in 1955 and 1921. Detroit's records go back to 1874.
Another way to look at the heat in July 2011 is by the number of 90 degree days. Detroit recorded 14 in July 2011 which is the second most 90 degree days for any month. The record is July 1955 with seventeen 90 degree days. Of course July 2011 also had six days with a high temperatures of 89 degrees!
As of July 31, Detroit has had 36 days in a row of high temperatures of 80 degrees or above. This is the second longest streak in Detroit's records. In 1955 there was a 42 day streak which ended on August 7, 1955.
July 2011 was the third warmest July and the third warmest month all time on record for Flint. The average temperature for July 2011 was 76.8. The record is 78.0 set in July 1921. Flint also recorded fourteen 90 degree days in July. This is tied for the 7th most 90 degree days in a month. The record is 20 set in July 1921. Flint has had 32 days in a row of high temperatures at 80 degrees or warmer. This is the 7th longest streak for Flint. The record is 54 days which ended on August 10, 1931.
July 2011 was the fourth warmest July and the fourth warmest month all time on record for Saginaw. The average temperature for July 2011 was 76.1. The record is 77.5 set in July 1921.