Why are car thermometers so inaccurate when the car’s been sitting in the sun?

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I’m at the point where I completely disregard any car’s outdoor temperature sensor. In hot days when the car’s been in the sun, they seem to all way overestimate the temperature compared to what the weather app says it is.

I get that the sun will heat up the car and since the thermometer sensor is on the car that heats up too. But what stops them adding some protection measure to the thermometer to avoid this, so that we can get accurate outdoor air temperature readings?

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5 Answers

Anonymous 0 Comments

Could be the parking lot.

Paved spaces get warmer in the sun (especially black asphalt) and end up boosting the local temperature by a lot compared to a nearby park or field or something.

Weather stations know about these kinds of effects and tend to install their temperature sensors in places that aren’t affected by them.

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