CLIMATOLOGY RAINFALL. 



15 



CLIMATOLOGY. 



RAINFALL. 



The rainfall of the territory under investigation decreases pro- 

 gressively from the eastern border to the northwest and southwest, 

 reaching the lowest limit in the southwest. The average annual 

 rainfall in Lavaca County in the extreme eastern portion of the sec- 

 tion is more than 30 inches, while at Llano, in the low mountain 

 country in the northwest, the average annual rainfall is only about 22 

 inches. In the extreme southwestern portion some localities report 

 as low an average as 20 inches or somewhat less. 



Table II. — Annual precipitation for 1909 in the region of San Antonio, Tex. 



Stations. 



Total 

 precipi- 

 tation. 



Departure 



from 



normal. 



Stations. 



Total 

 precipi- 

 tation. 



Departure 



from 

 normal. 





Inches. 



20.57 

 30.81 

 24.13 

 25.76 

 23.43 

 25.42 

 28.42 

 21.86 

 19.68 

 24.53 

 31.93 

 17.54 



Inches. 

 -13.78 

 + 1.25 



- 5.31 



- 6.11 

 -10. 66 



Kerrville 



Luling 



Indies. 

 26.02 

 21.26 

 21.14 

 19.66 

 16.59 

 18.94 

 19.34 

 14.92 

 29.81 

 20.72 

 18.19 

 33.58 



Inches. 

 - 3.83 





- 7.93 





Marble Falls 







New Braunfels 



-10.45 













-11.29 







Sabinal 







- 6.52 

 -15.79 





—11.91 







- 1.51 





Taylor . . 



-14.75 





- 1.22 

 -10.53 











— 2.96 









Table II shows that the total rainfall for the year varied from 14.92 

 inches at San Antonio to 33.58 inches at Victoria. All stations except 

 Beeville show less rainfall than normal, the departure varying from 

 about 4 to 15 inches in the greater portion of the territory. 



For the year 1909 only a narrow strip of territory about 25 miles 

 in width, occupying the extreme southeastern portion, had a rainfall 

 slightly over 30 inches. (See fig. 2.) The greater part of the terri- 

 tory north of Bexar County had a rainfall of 20 to 30 inches, while a 

 strip 25 or 30 miles wide lying just west of the more humid south- 

 eastern portion had a rainfall similar to the northern half. In a small 

 area at the extreme north in Williamson County the rainfall was only 

 10 to 20 inches. The extreme west and the entire southwest had a 

 rainfall of 10 to 20 inches with the exception of a small part of 

 Za valla and Dimmit Counties, where it dropped to less than 10 

 inches. From the above it may be seen that about one-half of the 

 entire area had a total annual precipitation ranging from 10 to 20 

 inches. 



226 



