NEW YORK - JULY 18: Wayne Semancik of Trenton, New Jersey pours water on his head to cool himself off July 18, 2006 in New York City. Temperatures are expected to stay above normal for the next several days. (Photo by Michael Brown/Getty Images)
NEW YORK - JULY 18: Wayne Semancik of Trenton, New Jersey pours water on his head to cool himself off July 18, 2006 in New York City. Temperatures are expected to stay above normal for the next several days. (Photo by Michael Brown/Getty Images)
Getty Images News Michael Brown
NEW YORK - JULY 10: A man wipes sweat from his face July 10, 2007 in New York City. New York City is experiencing a second day of a heat wave with temperatures in the upper 90`s and uncomfortable humidity levels. (Photo by Spencer Platt/Getty Images)
Getty Images News Spencer Platt
392180 04: Two women wipe their brows July 19, 2001 in Moscow, Russia as the capital city continues to experience an unusual heat wave, with temperatures exceeding 30 degrees Celsius over the past weeks. (Photo by Laski Diffusion/Getty Images)
Hulton Archive Laski Diffusion