10 



BULLETIN 4!)S, 1'. S. DEPARTMENT OE AGRICULTURE. 



Table VII shows the dales of the latest spring frosts and the 

 earliest autumn frosts, together with the minimum temperature 

 recorded for those dates in the 3 7 ears 1911 to 1915, inclusive. It will 

 be observed from this table that during the five years no frost occurred 

 in June, July, or August. None of the frosts recorded on the dates 

 mentioned in Table VII did any damage to cereals. The longest 

 frost-free period was in 1915, 211 days, and the shortest frost-free 

 period in 1914, 108 days. The average frost-free period for the five 

 years is 155.8 days. 



Table VII. — Data relating to killing frosts at the Moro substation in the years 1911 to 



1915, inclusive. 





Last in spring. 



First in autumn. 



Frost- 



Year. 



Date. 



Temper- 

 ature. 



Date. 



Temper- 

 ature. 



free 

 period. 



1911 



May 8 



Apr. 29 

 Apr. 27 



Mav 27 



Apr. 8 



May 2 



F. 

 32 

 31 

 31 

 32 

 32 



Oct. 17 

 Sept. 3 

 Oct. 15 

 Sept. 12 

 Nov. 5 



Oct. 5 



F. 

 32 

 31 

 32 

 32 

 30 



Days. 

 162 



1912 



127 



1913 



171 



1914 



108 



1915 



211 













155.8 















The prevailing winds at Moro are from the west, southwest, and 

 northeast. Southwest or west winds usually are accompanied by 

 cool or moderately warm weather in the summer and mild weather in 

 winter, while east or northeast winds are nearly always accompanied 

 by high temperatures in summer and low temperatures in winter. 

 Though wind velocities are never exceedingly high, the wind move- 

 ment is quite constant from about March 1 to August 31. The num- 

 ber of miles of wind during any 24-hour period rarely exceeds 350, 

 490 miles being the highest number recorded at the substation for 

 any one day of 24 hours during the years 1911 to 1915, inclusive. 



Table VIII gives the average wind velocity in miles per hour for 

 each month of the years 1911 to 1915, inclusive. 



Table VIII. — Average niml velocity (in miles per hour), by months, at the Moro substa- 

 tion in the years 1911 to 1915, inclusive. 



Year. 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Aver- 

 age. 



1911 



5.3 

 3.7 

 2.4 

 5.4 

 3.2 



5.4 

 4.9 

 2.8 

 5.0 

 4.0 



6.3 

 6.1 

 5.9 

 5.6 

 4.7 



9.6 

 8. 1 

 7.3 

 6.5 

 6.7 



9.2 

 7.8 

 8.3 

 7.1 

 5.4 



11.8 



5.9 

 6.9 

 8.8 

 8.2 



9.4 

 5.6 

 5.9 

 8.8 

 8.1 



9.2 

 5. 3 

 6.3 

 7.5 



7.5 



7.2 

 2.8 

 3.8 

 6.0 

 7.0 



4.8 

 2.0 

 5.0 

 4.0 

 6.1 



6.7 

 2.9 

 4.0 

 4.5 

 4.3 



5.5 

 4.1 

 2.7 

 3.9 

 5.4 



7.5 



1912 



1913 



4.9 

 5.1 



1914 



6.1 



1915 



5.9 









4.0 



4.4 



5.7 



7.7 



7.5 



8.2 



7.6 



7.2 



5.2 



4.4 



4.5 



4.5 



5.9 







