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 
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 
1 T=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 winter wheat, and the 
seasonal precipitation for spring small grains (Apr. 1 to July 31) 
in 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 1915, inclusive. 
Period. 
190S 
1909 
1910 
1911 
1913 
1914 
1915 
Aver- 
age. 
18. 53 
18.07 
14. 94 
9.16 
Annual 21.67 
Crop year for winter grains 
(Aug. 1 to July 31).* j 14.99 
Growing periods for winter 
grains 2 12.97 
Seasonal, for spring grains 
(Apr. 1 to July 31) 10.57 
23. 76 
22.15 
19.74 
10.88 
15.09 
18. 11 
15.67 
6. 50 
21.45 
17. 02 
13.61 
15.00 
22.31 
17.58 
14.96 
15.28 
13.90 
9.32 
15. 67 
16.78 
12.53 
9.38 
20.68 
17.94 
13.56 
11.06 
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- 
