Study: Hot cars can hit deadly temperatures in as little as one hour - The team found that a child trapped in a car in the study’s conditions could reach hyperthermic temperatures in about an hour if a car is parked in the sun, and just under two hours if the car is parked in the shade.

See the source article by following the link below:
Study: Hot cars can hit deadly temperatures in as little as one hour - The team found that a child trapped in a car in the study’s conditions could reach hyperthermic temperatures in about an hour if a car is parked in the sun, and just under two hours if the car is parked in the shade.