( 581 ) 

 B. Cloudy sky 



We may derive from these tables that the mean variation of 

 temperature with clear and with cloudy weather only differs in 

 the lower strata, but is nearly the same in the higher ones. 



In order to deduce from the numbers in this table the temperatures 

 themselves from kilometer to kilometer, I have also derived from 

 the data the following mean temperatures at the surface of the earth: 



Winter 

 Spring- 

 Summer 

 Autumn 



clouded sky 

 + 0°.l 

 + 6 .4 

 + 14 .4 



+ 9 .0 



clear sky 

 — 0°.9 

 + 5.1 



+ 14 .7 

 + 7 .9 



By means of these initial temperatures and the gradients of table I 



