RAINFALL OF WESTERN PORTION OF UNITED STATES. 51 
TABLE VI.—Precipitation of Dakota. 
Mean precipitation, in inches. A 
oS 
Station. = ; a : | S 
2 = 2 S 3 
= AB) © = =) a 
= | = a ra = a 
Stal n 4 S HK <a] 
ONG ee | Y. Bf. 
Homea DeLcroln iG? <-scseeecce na csceeeeee sess = 46 27 96 21 4. 80 8. 67 3.46 1, 85 18.78 136 
| Fort Buford. ...--. 2-222 ++--0+--2220- 22-22 eee 48 01 | 103 58 3.76 4.06 2.01 2. 01 11. 84 7 10 
| Fort Randall -. ---| 4301] 9837) 1,245 pe) 6. 22 3.40 118 15.52) 15 6 
| Fort Rice ..... ---| 46 32 | 100 eso eee 3, 63 4.87 1.54 1,35 11.39 61 
Fort Stevenson .. Se reees| UAT Sty || MODAN orca. 3.41 4.97 2.15 1.81} 11.84 6 2 
MOM isullye = sean ss secs Fe nencS cc caieeete tas 4450 | 100 35) 1, 672 6.52 7.18 1.70 1.14 | 16.54 7 8 
Fort Totten 3| 9916) 1,480 5.18 a UF 2.50 1.59 16.44 Bi (5 
Fort Wadsworth | 9710] 1,650) 7.00] 10.25| 3.98| 292/ 2415) 6 5 
LEI. 6). Sect script S> Suc a CeeEaoe Spe TerLan 8 57 | 97 03 768 4.02} 7.24 2.71 1:53") 115/50 4 8 
TIGR SAGE ASS AAO R Sea Aen ae eee Oe eer ae 4.78 | 6.74 2. 61 1.65} 15.78 | eae 
| 
Table V includes every station in Texas that has a record of five years 
or more, in all twenty stations. If the means of rainfall for the state be 
compared with the means for single stations, it will be seen that there is a 
general correspondence in the ratios pertaining to the different seasons, so 
that the former can fairly be considered to represent for the state the distri- 
bution through the year. Table VI presents the data for Dakota in the 
same way, and the correspondence between the general mean and the 
station mean is here exceedingly close. At each of the nine stations, the 
ereatest rainfall is recorded in summer, the next greatest in spring, and the 
least in winter. Placing the two series of results in the form of percentages, 
they show a decided contrast : 
Winter. | Year. 
Spring. Summer. | Autumn. | 
| ROE eocleieane Woes ee ee eee eee eee 30 | 43 | 7 | 10 100 
| 
TRERE Cacia ects selec ea eee ee 21 31 31 17 100 | 
In Dakota a rainy season is well marked, and 73 per cent. of the rain 
falls in spring and summer, or at the time when it is most needed by the 
farmer. In Texas only 52 per cent. of the rain falls in the season of 
agriculture. The availability of rain in the two regions is therefore in the 
ratio of 73 to 52, and for agricultural, purposes 20 inches of rainfall in 
Texas is equivalent to about 15 inches in Dakota. 
For the further exhibition of the subject, Table VII has been prepared, 
