10 
BULLETIN 498, U. S. DEPARTMENT OF AGEIC ULTTJBE. 
Table VII shows the dates of the latest spring frosts and the 
earliest autumn frosts, together with the minimum temperature 
recorded for those dates in the years 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 hilling 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 
May8 
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 
32 
31 
32 
32 
30 
Days. 
162 
1912 
127 
1913 
171 
1914 '. 
108 
1915 
211 
155.8 
WIXD. 
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 wind 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. 
T 
June. 
July. 
Aug. 
Sept. 
Oct, 
Nov. 
Dec ATer_ 
^ 8C - | age. 
1911 
5.3 
5.4 
6.3 
9.6 
9.2 
11.8 
9.4 
9.2 
7.2 
4.8 
6.7 
5.5 
7.5 
1912 
3.7 
4.9 
6.1 
8.4 
7.8 
5.9 
5.6 
5.3 
2.8 
2.0 
2.9 
4.1 
4.9 
1913 
2.4 
2.8 
5.9 
7.3 
8.3 
6.9 
5.9 
6.3 
3.8 
5.0 
4.0 
2.7 
5.1 
1914 
5.4 
5.0 
5.6 
6.5 
7.1 
8.8 
8.8 
t. 
6.0 
4.0 
4.5 
3.9 
6.1 
1915 
3.2 
4.0 
4.7 
6.7 
5.4 
8.2 
8.1 
7.5 
7.0 
6.1 
4.3 
5.4 
5.9 
Average 
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 
