CLEAR SUNLIGHT A REQUISITE 21 



Normal Cloudiness at California and Eastern Points 



Avg. for 



Mar. April. May. June July. Aug. Sept. Oct. Nov. 9 mo. 

 California 



It is noticeable that at the California coast points the average 

 cloudiness is almost twice that of the interior valleys, while at the 

 East the interior fruit regions of western New York, Ohio, and 

 Michigan, have a greater average cloudiness than the Hudson River, 

 New Jersey, and Delaware regions near the Atlantic seaboard. The 

 average cloudiness in the Eastern fruit regions is rather more than 

 twice as great as in the regions of California where most fruit is 

 grown. 



This excess of advantage, as it may be termed, in connection 

 with the high and protracted heat already mentioned, takes practical 

 form in the successful ripening of a second and sometimes a third 

 crop of these grapes in a season, from later bloom on younger cane 

 growth. This behavior is of more value as a demonstration of clim- 

 atic conditions than otherwise, for it is generally better to produce 

 the main crop alone than to undertake later ones. 



Another indication of excess of advantage in the interior valley 

 is found in the development of high sugar contents, which is of 

 direct value in raisin production. The same tendency, though per- 

 haps of less commercial value, is seen in the fact that some grapes 

 which yield a good claret wine nearer the coast develop too much 

 alcohol when grown in the interior. 



The advantage of California over Eastern and Southern fruit 

 regions in the abundance of clear sunshine is shown in the table 

 on the preceding page. Cloudiness is rated from to 10, three 

 observations daily, and the figures in the table are the averages from 

 these daily observations for a series of years, compiled from the 

 records of the U. S. Weather Bureau. 



RELATION OF ATMOSPHERIC HUMIDITY TO THE 

 GROWTH OF TREES 



Here is another important condition of the climate of California 

 which is intimately related to those which have been considered, 

 and which is to be credited with no small influence in the perfection 



