4 BULLETIN 1175, U. S. DEPARTMENT OF AGRICULTURE. 
The extreme range of annual precipitation during the 27-year period 
reported in Table 1 is from 14 inches in 1910 to 39 inches in 1915. 
Table 1. — Monthly and annual precipitation at Woodward, 01:1a., during the 27-year 
period from 1895 to 1921, inclum <-, . 
[Data (in inches) furnished by the United States Weather Bureau. T=trace. *=Data interpolated from 
near-by stations.] 
Year. 
Jan. Feb. 
1895. 
1895 . 
1897. 
1900 
1901 
1902 
1903 : 
1904 
1905 
1906 *. 75 
1907 *2.50 
*0.90 
1.04 
2.24 
♦1.40 
*.25 
.54 
.50 
.15 
*. 05 
T 
1908. 
1909. 
1910. 
1911. 
1912. 
1913. 
1914. 
1915. 
1916. 
1917. 
1918. 
1919. 
1920. 
1921. 
Average. 
*.25 
. 05 
.40 
T 
.03 
.40 
.18 
1.17 
1.29 
.43 
1.60 
.06 
.92 
1.86 
*2.00 
.02 
.60 
*1.50 
*.20 
.71 
T 
*.20 
-" 
T 
.25 
*.40 
*.25 
1.25 
.28 
.22 
S.09 
2.58 
2.44 
.51 
3.44 
.03 
.22 
.22 
1.46 
T 
1.02 
73 
Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 
1.15 
*0.10 
.10 
.70 
*1.20 
*1.00 
*. 50 
.51 
*1.50 
*1.25 
1.00 
1.20 
*1. 75 
*.20 
*1. 10 
.66 
T 

2.37 
.54 
.34 
1 . 45 
.92 
.34 
1.85 
1.60 
.82 
1.70 
*1.25 
3.67 
1.08 
*1. 25 
.49 
*1.60 
.81 
3.71 
*5. 75 
2.91 
*5.00 *2.60 
6. 15 4. 06 
*1. 75 
*1.75 
*1.75 
*4. 00 
*10.00 
*6.15 
*2.50 
1.13 
*2.30 *2.50 
*2.00 *2.00 
*1.70 *3.25 
. 45 4. 7S 
1. 97 . 53 
. 10 4. 13 
1.63 LIS 
1.11 
2.44 
7.08 
2.01 
1.93 
2.51 
4.87 
1.12 
1.85 
2.08 
3.53 
6.47 
1.74 
1.39 
4.49 
4.63 
4.19 
1.55 
91 2.34 3.32 3.37 
*o. 50 
5.30 
1.16 
*4. 75 
3.93 
+2.90 

*1.90 
*2.00 
4.97 
2.00 
*3.80 
*4. 75 
3.76 
2.45 
1.17 

3.02 
5.31 
.60 
2.87 
11.64 
1.89 
2.11 
3.76 
1.31 
8.00 
*4.00 
1.70 
.52 
*4.25 
4.16 
*2.10 
1.49 
*2. 30 
*1.00 
7.31 
*4. 50 
*5. 90 
*2. 75 
5.87 
1.54 
1.62 
3.54 
3.25 
.99 
.92 
3.46 

1.33 
1.79 
1.91 
5. 44 
3.15 
*5. 25 
1.00 
5.21 
*3.60 
.70 
.70 
1.75 
*.90 
*2. 10 
2.95 
1.30 
*4.00 
*6.00 
1.82 
.29 
7.65 
5.29 
2.90 
1.87 
2.92 
3.90 
1.15 
7.00 
.70 
1.72 
2.62 
6.85 
*0.70 
*3.00 
2.11 
*1.40 
4.00 
5.11 
1.65 
*.90 
. 65 
1.62 
2.00 
*2.75 
*.90 
4. 30 
j 4.88 
T 
.41 
3.44 
4.89 
.82 
6.27 
2.22 
1.90 
1.26 
.56 
6.34 
2.90 
0.50 
*3. 10 
*1.25 
1.70 
2. 25 
.97 
2.05 
*1.25 
1.15 
*. 75 
*. 70 
*4.00 
2. 65 
2. 75 
2.95 
.50 
1.05 
1.99 
2.52 
1.87 

3. .54 
2.75 
2.88 
.05 
2.84 3.04 
2.48 1.72 
1.13 
*.35 
*.05 
.44 
1.60 
T 

*1.50 
.32 
.10 
1.04 
*2. 60 
*.60 
1.47 
9.54 

.52 
.06 
3.50 
.05 
.56 
.95 
.77 
1.73 
4.54 
.62 

Dee. Annual. 
1.11 
*1.75 
*. .50 
*2. 65 
.58 
T 

*.90 
*T 
*1.25 
. 03 
*.80 
*2. 10 

.15 
.01 
2.90 
.07 
2.73 
.77 
.02 
38 
.18 
3. 58 
: 
2.04 
.30 
1.26 
24.04 
21.84 
19.13 
29. 
22.10 
21.13 
18.09 
23.25 
19.67 
24.20 
18.75 
*3L 55 
*26. 70 
27.52 
28.02 
14.01 
25.80 
21.00 
26.91 
15.08 
39. 21 
24.25 
17.38 
25.38 
27.86 
28.30 
29.23 
24.08 
The extreme variation in precipitation for any month during the 
growing period illustrates the irregular distribution of rainfall. 
During April, 1911, there was but 0.1 inch of rainfall, while in April, 
1915, there were 7.08 inches. In May,. 1910, 0.53 inch of rain fell 
while in May, 1915, there were 6.47 inches. No precipitation 
occurred during the month of June in 1901 and in 1911, and in June, 
1914, there was but 0.6 inch, while in June, 1916, there were 11.64 
inches and in June, 1921, 8 inches. No rain fell in July, 1916, while 
in July, 1904, there were 7.31 inches; in 1908, 5.87 inches: and in 
1920, 5.44 inches. The variation for August was from 0.29 inch in 
1909 and 0.7 inch in 1918 to 7.65 inches in 1910 and 7 inches in 1917, 
while the variation for September was from nothing in 1910 to 6.34 
inches in 1920. 
DISTRIBUTION OF MONTHLY PRECIPITATION. 
Figures showing only the monthly precipitation for a locality in 
the southern plains area do not give a complete view of the moisture 
conditions. The total monthly rainfall has sometimes been sufficient 
to produce large crops, yet it came at such intervals that long periods 
of drought occurred which damaged growing crops. To illustrate 
this fact and to show as nearly as possible actual moisture conditions 
during the various seasons, daily and monthly precipitation records 
for the eight years covered by these experiments are given in Table 2. 
