CEREAL EXPERIMENTS AT JUDITH BASIN" SUBSTATION. 5 



Table III. — Average monthly, seasonal, and annual precipitation {in inches) at Moccasin, 

 Mont., during the nine years from 1907 to 1915, inclusive. 



[Data from the records of the United States Weather Bureau and of the Biophysical Laboratory of the 



Bureau of Plant Industry.] 



Nine years. 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Sea- 

 sonal. 



Total. 



Average 



Maximum 



Minimum 



0.72 



1.34 



.09 



0.45 

 1.35 



.08 



0.92 



2.69 



.10 



1.09 



1.43 



.43 



3.20 

 7.31 

 1.34 



3.72 



6.75 



.64 



1.67 



3.54 



.20 



2.06 



6.34 



.51 



1.86 



4.47 



.73 



1.68 



6.27 



.20 



0.67 

 1.76 

 IT 



0.43 



1.21 



T 



9.69 

 13.90 

 6.50 



18.51 

 23.76 

 14.96 



iT=trace. 



Since winter wheat usually is sown during August and September 

 the record of seasonal precipitation for winter wheat should include 

 these months. Table IV shows the annual and average precipita- 

 tion in the calendar year and in the crop year for winter grains, the 

 precipitation during the growing season for whiter wheat, and the 

 seasonal precipitation for spring small grains (Apr. 1 to July 31) 

 ui the eight years from 1908 to 1915, inclusive. In the crop year 

 for winter wheat the figures are for the 12 months ended July 31 of 

 the year indicated; that is, they show the precipitation affecting the 

 crop of winter wheat harvested that year. In the same way, the 

 precipitation during the growing season for winter wheat includes 

 the three months (August to October) just preceding and following 

 the seeding season and the four months (April to July) of the follow- 

 ing spring and summer, thus covering the entire growth period of 

 the crop. The winter precipitation (November to March, inclusive) 

 may be easily determined by subtracting the figures for the growing 

 season from those immediately preceding them in Table IV. 



Table IV. — Annual and average precipitation {in inches) during the calendar year and 

 in the crop year for winter grains and seasonal precipitation for spring grains at the 

 Judith Basin substation in the eight years from 1908 to }915, inclusive. 



Period. 



1908 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



21.67 



23.76 



15.09 



21.45 



15.00 



14.96 



15.67 



20.68 



14.99 



22.16 



18.11 



17.02 



22.31 



15.28 



16.78 



17.94 



12.97 



19.74 



15.67 



13.61 



17.58 



13.90 



12.53 



13.56 



10.57 



10.88 



6.50 



7.69 



7.93 



9.32 



9.38 



11.06 



Aver- 



Annual 



Crop year for winter grains 

 (Aug. ltoJuly31).i 



Growing periods for winter 

 grains 2 



Seasonal, for spring grauis 

 (Apr. 1 to July 31) 



18.53 

 18.07 

 14.94 

 9.16 



1 The figures in each column are for the 12 months ended July 31 of the year indicated. 



2 The figures in each column are for August to October of the preceding year (precipitation affecting fall 

 growth) and April to July of the year indicated (precipitation affecting spring and summer growth). 



To permit comparison of the precipitation at Moccasin with that in 

 other portions of the State, the average annual precipitation at 25 

 different points in Montana, including Moccasin, is given in Table V. 

 These data were obtained from the records of the United States 

 Weather Bureau as published by the Montana Agricultural Experi- 



