--- title: "How long can you survive in a hot car?" description: "Under an hour on a warm day for a child — the interior gains about 20 °C in the first ten minutes. What actually happens physiologically, in what order, and what mov" url: https://atoneplace.net/could-you-survive/hot-car/ site: "At One Place" --- # How long can you survive in a hot car? **How long can you survive in a hot car?: Under an hour on a warm day for a child — the interior gains about 20 °C in the first ten minutes.** Dangerous within 10-20 minutes on a warm day; fatal within an hour A parked car is a solar oven: glass admits shortwave sunlight, interior surfaces absorb it and re-radiate at longer wavelengths that the glass does not pass, so heat accumulates. Measurements consistently show the interior rising roughly 19 °C above ambient within ten minutes and around 28 °C within an hour, which turns a mild 22 °C day into over 45 °C inside. Cracking the windows changes the final temperature very little. Children are at far higher risk than adults because their bodies warm three to five times faster relative to their mass and because they cannot let themselves out; dozens of children die this way each year in the United States alone. The same physics applies to dogs, which cool primarily by panting and lose that ability as the cabin approaches body temperature. ## What happens, in order | When | What | | --- | --- | | 10 minutes | Interior about 19 °C above outside air | | 30 minutes | About 24 °C above outside air | | 60 minutes | About 28 °C above outside air; a 22 °C day becomes over 45 °C inside | ## What changes the figure - Opening windows a crack has a negligible effect on the final temperature - Shade and light-coloured interiors slow it but do not prevent it - The risk exists on mild days, not only hot ones > Physiology, not instruction. Every figure here is a population range under particular conditions, and individual variation is large — temperature, exertion, fitness and health move all of them substantially. Nothing on this page is medical advice. ## Situations - [Can you survive a plane crash?](https://atoneplace.net/could-you-survive/plane-crash/) — Usually — across all US airline accidents studied, more than 95 per cent of occupants survived. - [How long do you have to escape a sinking car?](https://atoneplace.net/could-you-survive/sinking-car/) — Usually 30 seconds to a couple of minutes of floating — and the window is the way out, not the door. - [Can quicksand pull you under?](https://atoneplace.net/could-you-survive/quicksand/) — No. Quicksand is roughly twice as dense as a human body, so you float — you sink to about waist depth and stop. - [How far from a nuclear blast do you have to be to survive?](https://atoneplace.net/could-you-survive/nuclear-blast/) — It scales with yield: for a one-megaton airburst, survival is unlikely within about 5 km and likely beyond about 10-12 km. - [How long does it take to drown?](https://atoneplace.net/could-you-survive/drowning/) — Under a minute to lose consciousness — and it is almost silent, which is why so many drownings happen in sight of others. - [What happens if a lift cable snaps?](https://atoneplace.net/could-you-survive/falling-lift/) — Essentially nothing — lifts hang from multiple ropes and have a speed-triggered brake that grips the rails. - [What height can you survive falling from?](https://atoneplace.net/could-you-survive/falling-from-height/) — Survival is common below about 6 metres and rare above 20 — but people have survived falls from thousands. - [How likely are you to survive a shark attack?](https://atoneplace.net/could-you-survive/shark-attack/) — Very likely — of roughly 60 to 80 unprovoked bites worldwide each year, fewer than ten are fatal. - [What happens if you fall into lava?](https://atoneplace.net/could-you-survive/falling-into-lava/) — You would not sink — lava is about three times denser than a body — but you would not survive the heat either. - [What should you do if you are caught in a rip current?](https://atoneplace.net/could-you-survive/rip-current/) — Rips pull you out, not under. Swim parallel to the beach until you are out of the flow, then come in. - [Could you survive inside a whale?](https://atoneplace.net/could-you-survive/inside-a-whale/) — You cannot be swallowed by almost any whale — their throats are too narrow — and a stomach offers no air. - [How long do you have to escape a burning house?](https://atoneplace.net/could-you-survive/house-fire/) — Around three minutes from the alarm sounding in a modern furnished home. - [Can you survive a tsunami?](https://atoneplace.net/could-you-survive/tsunami/) — Yes, by moving inland and uphill immediately — 30 centimetres of moving water can knock an adult off their feet. - [How long can you survive in a sealed container?](https://atoneplace.net/could-you-survive/sealed-container/) — Carbon dioxide becomes dangerous long before oxygen runs out — a few hours in a cubic metre of air. ## Common questions ### How long can you survive in a hot car? Under an hour on a warm day for a child — the interior gains about 20 °C in the first ten minutes. ### What changes how long? Opening windows a crack has a negligible effect on the final temperature Shade and light-coloured interiors slow it but do not prevent it The risk exists on mild days, not only hot ones ## Related pages - [Can you survive a plane crash?](https://atoneplace.net/could-you-survive/plane-crash/) - [How long do you have to escape a sinking car?](https://atoneplace.net/could-you-survive/sinking-car/) - [Can quicksand pull you under?](https://atoneplace.net/could-you-survive/quicksand/) - [How far from a nuclear blast do you have to be to survive?](https://atoneplace.net/could-you-survive/nuclear-blast/) - [How long does it take to drown?](https://atoneplace.net/could-you-survive/drowning/) - [What happens if a lift cable snaps?](https://atoneplace.net/could-you-survive/falling-lift/) - [What height can you survive falling from?](https://atoneplace.net/could-you-survive/falling-from-height/) - [How likely are you to survive a shark attack?](https://atoneplace.net/could-you-survive/shark-attack/) - [How long can you survive without water?](https://atoneplace.net/could-you-survive/without-water/) - [How long can you survive without food?](https://atoneplace.net/could-you-survive/without-food/) - [How long can you survive without air?](https://atoneplace.net/could-you-survive/without-air/) - [How long could you survive in deep space?](https://atoneplace.net/could-you-survive/deep-space/) - [How long can you survive without sleep?](https://atoneplace.net/could-you-survive/without-sleep/) - [Could you survive on Mars?](https://atoneplace.net/could-you-survive/mars/) ## Sources - National Oceanic and Atmospheric Administration — NOAA (https://www.noaa.gov/) [Public domain (US Government)]