26 



The Vegetation of the 



mer months excessive heat is accumulating, what has the above effect 

 upon these winds. The same reason is good for the west during all the 

 summer months; in the rest the west winds are cooler. 



Northeast brings the most cloudiness, and west the least; the west is 

 the only one that has a cloudiness considerably below average. 



The relation of wind and precipitation must be considered in a double 

 way. When we compute the direction of wind in 1,000 observations of 

 precipitation, then we find that we have 258 times south wind; 174 times 

 east; 159 times northeast; 105 times southwest; 95 times west; 84 north- 

 west; 79 north, and 46 times southeast. But when we reduce the observa- 

 tions of precipitation to 1,000 of each wind direction, then we find for each 

 wind the following per mille. of rain observations: northeast, 317; south- 

 east, 153; southwest, 132; south, 126; northwest, 124; east, 111; north, 

 93; west, 46. That shows that northeast is the prevalent rain wind. But 

 the single months differ. In summer southwest brings the most rain, and 

 nearly all the thunder storms come from southwest or northwest. The 

 average number in a year is twenty-eight, • 



Table 7. 

 DIRECTION OF WIND FROM December, 1855, to November, 1885. • 



REDUCED TO 1000. 



