PEECIPITATION OF MOISTUKE. 



309 



Mean amount of precipitation of moisture, as rain and melted snow, for each month in the year. 



Xanie of station. 



>: 



- 

 a 



4 



P 



•8 



.d 

 * 



Pi 



< 



& 



3 



5 



1*. 



+3 

 m 



a 



bo 



3 



3 



s 



© 

 P. 



© 



CO 



u 



o 



fit 



o 

 o 

 O 



f4 



© 



> 



o 



ft 



u 

 c 



S 



© 



A 



Fort Randal], Dak 



0.49 



0.42 



0.99 



1.10 



2.G7 



2.30 



1.76 



2.56 



2.43 



1.09 



0.41 



0.30 





0.50 



1.18 



0.46 



1.63 



2.19 



0.48 



1.18 



1.66 



1.29 



1.08 



1.39 



0.47 







0. GO 



1.03 



1.82 



1.82 



2.18 



3.01 



2.30 



1.07 



1.30 



0.99 



0.64 





0.61 



0.46 



0.84 



1.06 



3.74 



1.90 



1.63 



1.37 



1.17 



0.97 



0.84 



0.57 





Mean amount of precipitation of moisture, as rain and melted snow, for the season and the whole year. 



Name of station. 



CO 



Fort Eandall, Dak 



Fort Pierre, Dak 



Fort Ahercroiulrie. Dak 



Fort Laramie, "Wyo 



Cheyenne, ~Wyo 



FortBuford, Dak 



4.76 

 4.28 

 4.67 

 5.64 

 3.11 



x 



6.64 

 3.32 

 7.49 

 4.90 

 5.56 

 6.49 



3.90 

 3.76 

 3.36 

 2.98 

 1.98 



1.21 

 2.15 

 1.82 

 1.64 

 0.37 



Tear. 



Extent of 

 series. 



16.51 

 13.51 

 17.34 

 15.16 

 10.02 

 11.75 



Years. Mo. 



12 



4 



Date. 



Beginning. End 



1857 

 1855 

 1860 

 1849 

 1871 

 1867 



1867 

 1857 

 1867 

 1864 

 1875 

 1874 



It will be noticed from a comparison of the above tables that the 

 rain-fall for the whole Upper Missouri region follows the same general law, 

 being greatest in the spring and summer months, from May to September, 

 and least in autumn and winter, coinciding with the observations made in 

 the Black Hills the past season. The season of 1875 was remarkably wet 

 generally throughout the United States. At Cheyenne and North Platte, 

 on the Union Pacific, 220 miles south of the Black Hills, the rain-fall was 

 not above the average, but at Yankton and Bismarck, Dakota, situated 

 nearly an equal distance north and east, it was unusually great, as is shown 

 in the following table, compiled from the records of the Signal Service, 

 United States Army: 



Name of station. 



Cheyenne, "Wyo 



Yankton, Dak 



Bismarck, Dak 



North Platte, Nebr 



Ph 



0.42 

 1.07 

 1.05 

 0.24 



0.06 

 1.51 

 1.32 

 0.26 



0.23 

 1.79 

 2.06 

 0.40 





0.50 

 5.26 

 4.22 

 6.21 



8 



1.20 

 2.04 

 3.40 

 1.69 



0.29 

 9.21 

 5.02 



1.62 





to 



4 



4. 47 2. 12 

 5. 53 4. 95 

 L 53 2. 89 



2. 12 | 0. 66 



•A 



1.34 

 5.33 

 1.85 



1.40 



0.60 

 0.14 

 2.37 

 0.14 





rH 



a 



1-1 m 



- 5 





£ « 





3 o 





© P 



ft 



tH 



0.84 



12.07 



0.12 



36.95 



1.33 



27.04 



0.52 



15.20 



