Phoenix sizzled through its 31st consecutive day of at least 110 degrees Fahrenheit and other parts of the country grappled Sunday with record temperatures after a week that saw significant portions of the U.S. population subject to extreme heat.

Phoenix sizzled through its 31st consecutive day of at least 110 degrees Fahrenheit (43.3 Celsius) and other parts of the country grappled Sunday with record temperatures after a week that saw significant portions of the U.S. population subject to extreme heat.