Is the temperature less in the shade?

I looked in the archives, but couldn’t find anything…

I know that it’s “cooler” in the shade, since the sun isn’t beating down on you. But, is the temperature (which I was taught measures how fast molecules are vibrating) less in the shade than in direct sun? Wouldn’t air mixing even out the differences that might exist? I would test this myself, but I don’t have a thermometer.

The temperature of objects sitting in sunlight would be hotter than those in the shade. As you said the suns beating down on them and they absorb radiation. A thermometer sitting in the sun should read a higher temperature than a thermometer sitting in the shade. The temperature of the air itself may be the same in the shade as it is in the sun because of circulation, but that depends on the degree of circulation and the size of the shadey area (among other things).

Well, I suppose that we are all objects – I was getting at the phrase that people/weathermen say … that “it was 110[sup]o[/sup]in the shade!” – well doesn’t that mean it was 110[sup]o[/sup] out of the shade as well?

Yes, they are saying that if it is 110 F in the shade, just think of how hot it was in the sunlight.

I mean, basically when you are in the sun, you are being heated by both the surrounding air (via convection) and by the sun’s rays themselves (via radiation heat transfer. Thus, you are always hotter in the direct sunlight.

The temperature as reported or predicted on the weather forecast is the temperature of the air. The temperature of the air, as you correctly point out, is the same in or out of the shade, because of mixing.

However, a thermometer exposed to direct sunlight will show an arbitrary temperature which could be as high as, say, 70 degrees C, but which is utterly meaningless. It does not mean, for example, that you can say “the temperature today was 30 in the shade and 70 in the sun”. The (air) temperature was 30 in the shade or not, and objects exposed to the sun reached various temperatures over time depending on their colour, shape, material properties and orientation.

As well as being protected from the sun, the thermometer is also raised 1 metre off the ground (so as not to be influenced by ground temperature) and screened from rain and snow.

I PUT A THEMOMETOR WERE THE SUN DONT SHINE AND IT ABOUT 36.7 DEGREES CELCEUS :smiley:

But you’re feel 30 degrees hotter in the sun, regardless of the ambient air temperature, and that’s all that counts. (In the summer. Maybe only 20 degrees in the winter.)

and smelly:D