GEAIN-SOEGHUM EXPERIMENTS IN THE PANHANDLE OF TEXAS. 



MONTHLY AND ANNUAL PRECIPITATION. 



In Table I are shown the monthly, the annual, and the mean 

 annual precipitation, in inches, at Amarillo, Tex,, during the 25- 

 year period from 1892 to 1916, inclusive. The monthly precipita- 

 tion and the departure from the norm.al will be found in Table IV. 

 The mean annual precipitation at AmariUo during this 25-year 

 period is seen to be 21 inches, more than tliree-fourths of which 

 falls during the growing season for gram sorghums, the six months 

 from April to Septembei, inclusive. 



Table I. — Monthly and annual 'precipitation at Amarillo, Tex., during the 25-year 

 period from 1892 to 1916, inclusive. 



[Data (in inches) furnished by the observer of the United States Weather Bureau at Amarillo, Tex. 



T. =3 trace.] 





























An- 

 nual. 



Mean 



Year. 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



an- 

 nual. 



1892 



0.42 



0.57 



2.10 



0.21 



2.70 



1.49 



1.85 



1.93 



0.24 



2.85 



0.16 



1.08 



16.60 





1893 



.09 



2.03 



T. 



.16 



2.19 



2.03 



2.05 



2.67 



5.27 



.03 



.28 



.43 



17.23 



16.42 



1894 



.02 



1.15 



.05 



.85 



1.30 



3.59 



1.82 



3.41 



2.41 



.39 





.82 



15.81 



16.21 



1895 



1.60 



1.92 



.16 



1.31 



1.78 



6.84 



2.88 



3.87 



.57 



2.26 



.81 



.79 



24.79 



18.36 



1896 



.76 



.41 



.21 



1.95 



2.20 



2.31 



7.04 



.63 



2.45 



3.09 



.35 



2.88 



24.28 



19.54 



1897 



2.26 



.65 



.47 



1.08 



4.44 



2.32 



2.16 



2.71 



.73 



1.63 



.08 



.63 



19.16 



19.48 



L898 



.86 



.82 



.35 



.98 



3.52 



4.81 



3.88 



4.03 



.48 



.41 



..34 



2.06 



22.55 



19.91 



1899 



.29 



.07 



.17 



.23 



3.12 



4.45 



6.96 



.51 



6.09 



1.15 



3.24 



1.11 



27.39 



20.85 



1900 



.59 



.47 



.48 



5.47 



4.53 



1.94 



3.21 



.83 



5.25 



1.58 



.08 



.07 



24.40 



21.24 



1901 



.03 



.48 



.02 



4.90 



5.99 



.82 



1.56 



3.03 



2.19 



3.26 



2.00 



.04 



24.42 



21.56 



L902 



.04 



T. 



.54 



1.83 



9.14 



2.01 



1.45 



2.42 



.95 



1.74 



2.24 



.55 



23.11 



21.70 



1903 



.12 



2.93 



.26 



.90 



1.79 



2.83 



3.38 



4.67 



.82 



2.58 





T. 



20.28 



21.58 



L904 



.16 



.08 



T. 



.63 



2.88 



5.53 



2.48 



4.69 



3.55 



.44 



.20 



.69 



21.33 



21.56 



L905 



1.00 



1.52 



2.62 



4.52 



6.16 



2.19 



3.76 



.63 



3.08 



..30 



5.09 



1.45 



32.32 



22.33 



1906 



.41 



.51 



.64 



3.23 



1.18 



2.07 



2.90 



6.76 



1.96 



2.49 



2.58 



.19 



24.92 



22.50 



1907 



1.11 



.24 



.02 



1.25 



.99 



1.97 



1.49 



6.20 



.91 



1.79 



.66 



1.46 



18.09 



22.22 



1908 



.26 



.72 



T. 



1.90 



3.55 



1.73 



5.40 



2.75 



1.83 



.40 



.51 





19.05 



22.04 



L909 



.07 



.28 



1.28 



.50 



1.08 



4.72 



3.63 



.87 



2.19 



1.18 



3.25 



.54 



19.59 



2L90 



L910 



.05 



.17 



.34 



.59 



2.99 



.66 



3.57 



2.19 



.05 



.26 



.28 



T. 



11.15 



21.34 



1911 



.13 



2.88 



..50 



2.76 



5.88 



.20 



3.85 



2.97 



.83 



.84 



.94 



.95 



22.73 



21.41 



1912 



T. 



1.85 



.78 



.82 



1.62 



2.31 



2.50 



1.51 



2.28 



.33 



T. 



.33 



14.33 



21.07 



L913 



.11 



.55 



.59 



1.76 



1.41 



2.32 



1.80 



.61 



4.19 



.81 



1.98 



2.84 



18.97 



20.98 



1914 



.06 



.01 



.15 



.95 



4.43 



.84 



3.07 



2.97 



1.07 



4.46 



T. 



1.17 



19.18 



20.89 



L915 



.72 



1.60 



1.00 



5.05 



1.70 



1.04 



4.14 



5.85 



4.69 



1.55 



.18 



.13 



27.65 



21.18 



1916 



.36 



.02 



.57 



1.71 



.89 



2.18 



.94 



3.82 



1.76 



2.90 



.40 



.88 



16.43 



20.99 



Average.. 



.46 



.88 



.53 



1.82 



3.09 



2.53 



3.11 



2.90 



2.23 



1.55 



1.06 



.84 



20.99 





A study of Table I shows, among other things, that there js a 

 wide fluctuation in the annual precipitation, which comes mostly in 

 the form of rain. For example, in 1910 it was 11.1 inches, while in 

 1905 it was 32.3 inches, or almost three times as much. The next 

 lowest record is 14.3 inches, in 1912, and the next highest 27.7 inches, 

 in 1915. 



Interesting figures in the table are those which apparently show 

 periodical recurrence in precipitation. The records begin only in 

 1892. In the first 3 years the annual precipitation was low, the 

 highest being only 17.2 inches. The mean for these 3 years is only 

 16.2 inches. Then follows a period of 12 years, 1895 to 1906, inclu- 

 sive, in which the annual precipitation is high. In this period it 

 drops below 20 inches but once, in 1897. On the other hand, it once 



