US meteorologists report that July 2011 was considered the second-hottest month in recorded history in New Jersey, USA, and was the hottest month ever in the nation's capital of Washington, DC.  

http://www.washingtonpost.com/blogs/capital-weather-gang/post/july-2011-the-hottest-month-in-washington-
dc-history/2011/07/31/gIQAd8rOnI_blog.html
http://www.northjersey.com/news/environment/July_was_NJs_2nd-hottest_month_ever.html

Thousands of fish found perished in an Indiana, USA lake during the July 2011 heat wave are thought by Department of Natural Resource officials to have suffocated from reduced oxygen levels in the overly warm water.

http://www.sott.net/articles/show/232450-U-S-Thousands-of-fish-turned-up-dead-in-Indiana-lake
http://www.wave3.com/story/15144330/why-biologist-says-thousands-of-fish-turned-up-dead-in-indiana-lake