It's felt so hot over the last couple of weeks that whatever temperature your car tells you it is you would probably believe.
But some of you will have no doubt noticed that the temperature reading on the dashboard of your car seems ridiculously high at the moment.
And that it might drop as much as 10C after a few miles of driving.
Well it's not all down to the heatwave.
It's all down to the way your vehicle measures heat.
What is going on?
Firstly, the device giving you the reading on a dashboard is a thermistor NOT a thermometer, our sister website Wales Online reports .
While thermistors work in a similar manner to thermometers they don't rely on a traditional liquid like mercury.
Instead they measure the change in electrical current as a result of heat added or taken away.
Why are they telling me the wrong temperature?
Technically they are getting the right reading.
Unfortunately other factors affect them.
The thermistor is (usually) located at the front of your car just below the grill.
This means that it is very close to the surface of the road.
Black tarmac absorbs lots of heat and is much hotter than the air.
Anyone who has run along hot sand will know the feeling.
This means it gets a reading which is much higher than it feels outside and is why you often see a temperature drop straight after it has started raining.
They are also far more accurate at night or when conditions are cloudy.
