(KAIT/NBC) - It's already happened at least once this July; a 17-month-old forgotten in a car for nearly 9 hours didn't survive.
This summer, the Florida Highway Patrol and Department of Children and Families are working together to demonstrate the dangers of leaving children in hot cars.
Researchers tested cars left in the sun on a 100-degree day in Arizona, it took just an hour for the interior temperature to hit 116°F.
But even cool days are a threat.
Another child died in Westchester, Florida during last February's colder temperatures.
Communications Director Beatriz Lopez says mistakes can happen.
"What's important to understand is that children have died from heat stroke from being in a car in 50 and 60-degree weather," says Lopez.
Officials advise never leaving a child alone in a car, even with a window open-not even for a minute.
Sweetwater police say they've found two kids left at the Dolphin Mall over the past year using special patrols.
Click here for some tips to keep kids safe during summer months.