Subject: Why do insects hover above trees in the evening

Dear Sir/Madam,

Good day to you. I am dying to know why insects hover above trees in the 
evening? From what I know, trees respire and give out heat to the surroundings. 
So is it the main reason why insects hover above trees to get some warmth from 
them? Do trees also trap heat from the sun during daytime and release it at 
night? Do the trees release heat at a faster rate to the surroundings during 
evening time compared to other objects around, therefore the insects hover above 
the trees instead of going to other objects? Kindly get back to me on this, 
please. Thank you very much and have a nice day.   

Re: Why do insects hover above trees in the evening