[efavdb]

Can feel the same effect here in CA. I’ve heard that in areas with more humidity the effect is much weaker though, presumably because the air has higher heat capacity or something and so doesn’t cool as quickly in the shade.

[SoftTalker]

I live in the Midwest US, plenty humid here in the summer but it’s consistently 5 degrees cooler in my wooded neighborhood than it is in the nearest town about 10 miles away. The effect is real.

[efavdb]

Interesting. I asked a friend from Texas and he said he wasn't even aware that shade was cooler until he moved out. Need more data.

[ahartmetz]

Might also have something to do with the ground and trees evaporating less water into the already humid air, reducing the cooling effect of evaporation.