Mashable: According to the calendar, Monday is the first day of summer. For millions of people in the Southwest, from Phoenix to Los Angeles, the extreme heat today will make it feel more like mid-July.
High temperatures are forecast to reach nearly 120 degrees Fahrenheit in the Phoenix area, after hitting 118 degrees on Sunday. The 118-degree high temperature was the fifth-warmest day on record there, and if the city were to see a 120-degree high temperature on Monday, it would be only the fourth time...