10 
BULLETIN 1175, U. S. DEPARTMENT OF AGRICULTURE. 
standing 2 feet above the surface of the ground and represent closely 
the movement of wind actually sweeping over the surface of the land. 
Winds of this velocity can cause great damage to crops by covering 
the young plants, cutting them off with moving sand particles, or 
causing the crop to lodge when mature or nearly so. 
Table 4. — Relativt humidity, temperature, and wind movement recorded at the Woodward 
Field station in tht 6 months from April to September, inclusive, during the 8-year 
period from 1914 to 1921, inclusive. 
fear and month. 
ive 
1914: 
April 
May 
June 
July 
August 
September. 
1915: 
April 
May 
June 
July 
August 
September . 
1916: 
April 
May 
June 
July 
August 
-September. 
1917: 
April 
May 
June 
July 
August 
September. 
1918: 
April 
May 
June 
July 
August 
September. 
1919: 
April 
May 
June 
July 
August 
September. 
1920: 
April 
May 
June 
July 
A ugust 
September. 
1921: 
April 
May 
June 
July 
August 
September. 
Relatr* 
humid 
ity.i 
Per 
cent. 
50.5 
62.1 
49.4 
48.6 
55.2 
56.9 
61.4 
64.1 
60.1 
70.5 
57.8 
48.5 
62.0 
48.9 
48.1 
55.4 
57.1 
55. 1 
39.7 
46.1 
63.6 
64.3 
61.3 
52.9 
54.1 
54.0 
47.4 
61.8 
68.1 
74.3 
71.5 
59.2 
62.7 
62.9 
52.2 
66.3 
57.9 
57.9 
66.6 
62.3 
55.8 
bo. 3 
69.3 
60.8 
53.6 
56.8 
Moan. 
Read- 
: I 
°F. 
58 
66 
81 
83 
79 
75 
60 
62 
73 
78 
72 
3 71.C 
Temperature 
Maximum 
Wind. 
ing. 
Date. *■* 
F. 
'.'7 
92 
104 
104 
100 
110 
11(1 
102 
100 
79 
101 
106 
102 
105 
Kin 
104 
99 
92 
bit 
107 
96 
94 
94 
96 
95 
till 
107 
16 
10 
28 
2 15 
20 
22 
17 
12 
13 
4 
7 
1 
8 
24 
27 
3 
21 
22 
3 
30 
10 
14 
10 
29 
2 25 
30 
1 
30 
24 
23 
2 27 
27 
18 
5 
2 
Minimum. 
°F. 
24 
42 
61 
61 
60 
44 
31 
37 
47 
55 
45 
3 46 
22 
40 
53 
58 
50 
Pre- 
vail- 
in? 
Date direc " 
• tion. 
38 
28 
2 12 
26 
4 
29 
3 2 7 
E 
E 
S 
E 
S 
sw 
SW 
E 
s 
sw 
sw 
NW 
SW 
S 
SW 
SE 
.SE 
NE 
Monthly 
move- 
ment. 
Highest day. 
Move- n . 
ment. Udte ' 
9 
SW 
229 
SW 
1 
SW 
2 30 
sw 
19 
sw 
9 
sw 
20 
SE 
1 
SW 
22 
sw 
31 
sw 
22 
sw 
sw 
ESE 
SW 
SE 
52 
13 
SE 
33 
29 
SE 
26 
9 I 
NW 
36 
2 
SW 
58 
19 
SE 
63 
9 
SE 
55 
2 
SE 
40 
29 
SW 
Milis. 
7,344 
6,845 
7,920 
4,613 
4,836 
5,688 
5,952 
5,544 
5,580 
3,050 
4,248 
6,624 
6,770 
5,976 
4,241 
5,506 
5,904 
8,237 
6,653 
6,720 
5,597 
3,774 
3,257 
5,678 
8,129 
4,649 
4,745 
4,680 
3,874 
6,S50 
4,531 
3,694 
5,090 
4,531 
5,332 
8,047 
5,681 
7,116 
4,565 
3. 756 
4,728 
Miles. 
440 
400 
463 
298 
316 
331 
481 
413 
351 
341 
445 
446 
478 
235 
287 
464 
504 
475 
495 
300 
234 
247 
360 
462 
295 
420 
262 
266 
523 
307 
288 
321 
283 
337 
608 
341 
431 
361 
250 
342 
6,559 
440 
5,023 
255 
3,910 
284 
4,555 
426 
4,351 
2.-.:. 
6,331 
429 
i The relative humidity was calculated from wet and dry bulb readings taken at 
p. m. each day. 
2 The same "temperature occurred on other dates. 
3 Data taken from Climatological Data, Oklahoma Section. Annual Summary 
United States Weather Bureau station at Woodward, Okla. 
a. m., 1 p. m., and 
1915, from records of the 
