BULLETIN 402, U. S. DEPABTMENT OF AGEICULTUEE. 



Wind is an important element of the climatic influences in this 

 section of the Great Plains. Eecords of wind velocity have been 

 made during the summer months since 1908 and during the entire 

 year since 1912. The available records for the 8-year period, 1908 

 to 1915, inclusive, as given in Table V, show an average wind velocity 

 of 6.9 miles per hour. The months of April and May have average 

 wind velocities higher than any of the other months. The highest 

 wind velocity for any one month is 10.3 miles per horn", in May, 1909. 

 The lowest wind velocity was recorded in August, 1915. The pre- 

 vaihng winds at the Akron Field Station are from the southwest 

 during the summer and from the northwest during the winter. 



Table V. — Average wind velocity at the Akron Field Station, Akron, Colo., by months, 

 1908 to 1915, inclusive, as far as data are available. 



[Data (in miles per liour) from tlie records of tlie Biophysical Laboratory of the Bureau of Plant Industry.] 



Year. 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Aver- 

 age. 



1908 





• i 





8.0 

 6.8 

 8.6 

 7.4 

 6.1 

 8.1 

 5.8 

 6.8 



6.0 



6.1 8. 



6.1 



7.1 



5.4 



6.1 



5.8 



6.2 



6.7 

 6.8 

 5.0. 

 8.1 

 4.7 

 5.6 

 6.5 

 4.3 



7.6 

 6.7 

 6.0' 

 7.0 

 6.0 

 6.4 

 6.9 

 6.4 











1909 









9.0 



10.3 

 8.1 

 9.7 

 8.5 

 6.9 

 7.4 

 7.7 











1910 .-.. 





.. 





7.1 



5.1 



6.3 





1911 



6.2 

 6.7 

 6.2 

 8.2 

 8.0 



6.5 

 7.5 

 4.9 

 6.6 

 6.5 



8.7 

 7.8 

 6.6 

 8.5 

 7.3 



9.1 

 9.9 

 8.1 



8.7 

 7.5 





1912 



6.1 

 7.1 

 6.4 

 5.7 



5.7 

 5.1 

 6.2 

 7.9 



6.3 

 8.5 

 5.8 

 6.0 



6.7 



1913 



6.6 



1914 



6.9 



1915 



6.7 







Average 



7.0 



6.4 



7.7 



8.7 



8.3 



7.2 



6.2 



5.8 



6.6 



6.9 



6.0 



6.0 



6.7 



TEMPERATURE. 



The temperatures at the Akron Field Station are recorded by means 

 of maximum and minimum dry-bulb thermometers, supplemented by a 

 thermograph during the growing season. A summary of the recorded 

 data is given in Table VI. The records are complete for the six 

 months from April to September, inclusive, for the 8-year period, 

 1908 to 1915. Sufficient data are available for other months during 

 a portion of this period to form a good basis for study. 



The month of August has the highest average maximum tempera- 

 ture, 85° F. December and January have the lowest average mini- 

 mum, 13° F. The highest maximum for any one month is 90° F., 

 recorded for July, 1910. Temperatures of 100° F. are not uncommon 

 during July and August. The combination of high winds and high 

 temperatures with only light showers usually causes a droughty 

 condition to prevail from about June 15 to August 31, as noted in the 

 discussion of precipitation. 



