6 BULLETIN 398, U. S. DEPARTMENT OF AGEICULTURE. 



merit Station.^ In nearly all cases the average is for 16 years, 1898- 

 1913, inclusive. 



Table V shows that the precipitation at Moccasin is a little higher 

 than in eastern Montana, but about the same as that of the central 

 and western parts of the State. The locations of the stations for 

 which data are given are shown in figure 2. 



Table V.^ — Average precipitation at 25 stations in Montana, including Moccasin, for the 



years indicated. 



[Data from the records of the United States Weather Bureau.] 



Station. 



Period. 



Average. 



Eastern Montana: 



Ekalaka 



16 years (1898 to 1913) ... 



Inches. 

 13 32 



Glendive 



do 



15 50 





do 



14 12 





do 



13 95 



Miles City 



do 



14 07 





10 years (1904 to 1913) 



13 32 



Crow Agency 



16 years (1898 to 1913) . . 



15 37 





9 years (1905 to 1913) 



14 15 



Central Montana: ' 



16 years (1898 to 1913) 



12 39 





do 



12 96 



Fort Benton 



15 years (1898 to 1912).. 



13 71 



Great Falls 



16 years (1898 to 1913) 



15 86 





do 



19 77 



Red Lodge 



do 



19 76 



Livingston 



15 years (1896 to 1910) 



14 33 





16 years (1898 to 1913) 



18 28 



Western Montana: 



16 years (1898 to 1913) 



14 06 



Adel 



do 



21 35 





do 



16.50 



Cut Bank 



. . do 



14 76 





do 



15.32 





do 



15.31 



Butte 



do 



14.65 



Dillon 



do 



17.86 









SUMMAEY. 



Average at 8 stations: 

 In eastern Montana. 

 In central Montana. . 

 In western Montana. 



14.23 



15.88 

 16.22 



Average at all stations 15. 44 



Moccasin, 16-year period (1898 to 1913) 16. 46 



EVAPORATION. 



Of the climatic factors that influence crop growth, evaporation is 

 probably next in importance to seasonal precipitation. Evaporation 

 records have been taken at Moccasin since 1909. The evaporation 

 is determined from a free water surface, the method being the one 

 usually employed where the Biophysical Laboratory of the Bureau 

 of Plant Industry is cooperating. ^ 



Records are taken during six months, April to September, inclusive. 

 In Table VI the evaporation and precipitation in these months are 



1 Burke, Edmund, and Piackney, R. M. Temperature records 1898-1913. An appendix to report 

 on Montana climate. Mont. Agr. Exp. Sta. Bui. 99, p. 68-143. 1914. 



2 Briggs, L. J., and Belz, J. O. Dry farming in relation to rainfall and evaporation. U. S. Dept. Agr., 

 Bur. Plant Indus. Bui. 188, p. 16-20. 1910. 



