8 BULLETIN 836, TJ. S. DEPARTMENT OF AGRICULTURE. 



Humidity. 



The atmospheric humidity of this section is low on the average. 

 It decreases and the wind velocity increases from the central part of 

 Oklahoma westward. The usually low humidity at Woodward no 

 doubt plays an important part in influencing transpiration from 

 the growing crops. 



Table III. — Monthly climatic data, covering temperature and wind movement, 

 recorded at the Woodward (Okla.) Field Station in the six months, April to 

 September, inclusive, of each year (During the 5-year period from 1914 to 

 1918, inclusive. 



Season and month 



Season of 1914: 



April 



May 



June 



July 



August 



September 

 Season of 1915: 



April 



May 



June 



July 



August 



September 

 Season of 1916: 



April 



May 



June 



July 



August 



September 

 Season of 1917: 



April 



May 



June 



July 



August 



September. 

 Season of 1918: 



April 



May 



June 



July 



August 



September, 



Temperature. 



Mean. 



Maximum. 



Read- 



'F. 

 96 

 92 

 103 

 106 

 101 

 100 



92 

 92 

 100 

 99 

 99 



105 

 101 

 103 

 104 

 98 



109 

 108 

 100 

 102 



82 

 99 

 106 

 103 

 105 

 102 



Date. 



16 

 10 

 28 

 <*29 

 20 

 10 



28 

 13 

 20 

 12 



17 

 10 



all 

 7 

 1 



19 



a 3 



12 



22 

 17 

 12 

 13 

 4 



1 



8 



24 



15 



a 3 



15 



Minimum. 



Read- 

 ing. 



Date. 



a 8 



28 



all 

 30 



Wind. 



Prevail- 

 ing 

 direction 



N. 

 S. 

 S. 



s. 

 s. 

 s. 



s. 



E. 

 E. 



s. 



E. 



S. 



sw. 

 sw. 



E. 



S. 

 SW. 

 SW. 



NW. 



SW. 



s. 

 sw. 



SE. 



SE. 



NE. 

 SE.-SW 



sw. 



sw. 

 sw. 

 sw. 



Monthly 

 move- 

 ment. 



Miles. 

 7,344 

 6, 845 

 7,920 

 4,613 

 4,836 

 5,688 



6,768 

 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 



Highest day. 



Move- 

 ment. 



Miles. 

 440 

 400 

 463 

 298 

 316 

 331 



481 

 413 

 351 

 342 

 189 

 302 



445 

 446 

 478 

 235 



287 

 381 



507 

 475 

 495 

 300 

 234 

 247 



360 

 462 

 295 

 420 

 262 

 266 



Date. 



19 

 10 

 22 

 2- 

 10 

 27 



16 

 17 

 11 

 29 

 5 

 25 



14 

 19 

 30 



4 



6 

 24 



a Other dates also. 



Wind. 



Monthly data on wind are shown with other data in Table III 

 for the crop season (April to September) in the 5-year period from 

 1914 to 1918, inclusive. The wind velocity for the season averages 

 high. Some days are calm ; then there are other days when the 

 wind moves at a very high velocity. The highest total movement 

 for one day during that period was 507 miles, which occurred on 

 April 16, 1917. This is an average of more than 21 miles an hour 



