ScienceDaily (Aug. 26, 2009) — From mid July to early August 2006, a heat wave swept through the southwestern United States. Temperature records were broken at many locations and unusually high humidity levels for this typically arid region led to the deaths of more than 600 people, 25,000 cattle and 70,000 poultry in California alone.
http://www.sciencedaily.com/releases/2009/08/090825151008.htm