GRAIN-SORGHUM EXPERIMENTS IN THE PANHANDLE OF TEXAS. 5 
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 normal will be found in Table IV. 
The mean annual precipitation at Amarillo durimg this 25-year 
period is seen to be 21 inches, more than three-fourths of which 
falls during the growing season for grain sorghums, the six months 
- from April to September, inclusive. 
TaBLeE 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. 
Va bTaAceat 
Year. Jan. | Feb. | Mar. | Apr. |May.| June.| July. sv Oct. | Nov.| Dec. 
Legis 0.42 | 0.57 | 2.10 | 0.21 | 2.70 | 1.49 | 1.85 | 1.93 | 0.24 | 2.85 | 0.16} 1.08] 15.60 ]....... 
ice a ee 09 | 2.03] ©. |. .16| 2.19 | 2.03 | 2.05 | 2.67] 5.27] :03] +28] 243] 17.23 | 16.42 
104 02) 1.15| .05| .85| 1.30| 3.59 | 1.82] 3.41] 2.41] 139]... 82| 15.81| 16.21 
(ie aa 1.60 | 1.92| -16| 1.31 | 1.78] 6.84] 2.88 | 3.87] .57| 2.26] <81| °79| 24.79] 18.36 
ie ae :76| .41| .21| 1.95 | 2.20] 2.31] 7-04] .63| 2.45] 3.09] 135] 2.88] 24.28) 19.54 
ci aa ee 2.26} .65| .47| 1.08 | 4.44 | 2.32| 2.16| 2.71| 7311.63] :08| .63| 19.16] 19.48 
ii aaa -86| .82| .35| .98| 3.52] 4.81] 3.88| 4.03] .48| .41| 134] 2.06] 22.55] 19.91 
180920205 29] 07) 17 | 23 | 3.12 | 4.45 | 6.96 | 51) 6.00) 1-15 | 3.24) 1.11) 27.39 | 20.85 
1008s -59| .47| .48| 5.47| 4.53] 1.94] 3.21] .83]5.25|1.58| .08| .07| 24.40| 21.24 
POIs ce :03| .48] .02| 4.90] 5.99] .82]| 1.56 | 3.03] 2.19| 3.26] 2.00] .04| 24.42] 21.56 
apres? 04] T. | 154 | 1.83 | 9.14| 2.01] 1.45] 2.42] 195] 1.74] 2.04] .55| 93.11) 21.7 
icc ie -12| 2.93] :26| .90| 1.79 | 2.83 | 3.38 | 4.67] .82] 2.58 |...... Me) | 20:28) 21.58 
fA0e :16| .08| T. | .63| 2.88] 5.53 | 2.48] 4.69/3.55| .44] .20| .69| 21.33} 21.56 
POOR ide 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 
1a06) 22123 -41| 151! .64 | 3.231 1.18] 2.07 | 2.90] 6.76! 1.96 | 2.49! 2.58] .19! 24.92] 22.50 
IAG = 111} .24| :02| 1.25] .99] 1.97| 1.49] 6.20| .91] 1.79] .66| 1.46| 18.09] 22.92 
Cie ne -26| .72| T. | 1.90| 3.55 | 1.73 | 5.40] 2.75] 1.83] 140] -51|...... 19.05 | 22.04 
iG idea .07| 128] 1.28] .50| 1.08] 4.72| 3.63| .87| 2.19] 1.18] 3.25] .54| 19.59] 21.90 
foie os 05| .17| .34| .59| 2.99] .66|3.57|2.19| .05| .26] .98| T. | 11.15] 21.34 
POUT oor 13 | 2.88| .50|2.76|5.88| .20]3.85|2.97| .83| :84] .94| .95| 22.73] 21.41 
igre T. 11.85] .78| .82| 1.62] 2.31] 2.50] 1.51] 2.28] °33 -33 | 14.33] 21.07 
iC ed eae 11} .55| 259] 1.76 | 1.41 | 2.32| 1.80] -61| 4.19] °81] 1.98] 2.84] 18.97) 20.98 
T9142. 06] .01] :15| .95] 4.43] .84] 3.07] 2.97] 1.07] 4.46] T. | 1.17] 19.18] 20.89 
i ae 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 
qO1G== == 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 [......2 
| | 
A study of Table I shows, among other things, that there is 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 
