FIFTEENTH ANNUAL YEAR BOOK— PART XI 7G7 



greatly by these adverse conditions, and corn probably never deteriorated 

 more in 48 hours than it did on those two days. While August will go 

 on record as a dry month, and great damage was done by the drouth, 

 yet rain fell at some point in the state on every day of the month. 

 The showers were, however, widely scattered and of but slight benefit, 

 except in a few localities of small area, until near the close of the 

 month. Copious and quite general showers occurred on the 23d, 27th 

 and 31st, which afforded great relief to vegetation, and put the ground 

 in condition for plowing. 



The month closed with severe local wind, rain and electric storms in 

 many localities. Wind did much damage to trees and buildings, and 

 wind and rain seriously injured the corn crop. 



Pressure. — The mean sea level pressure for the state was 29.96 inches. 

 The highest recorded was 30.37 inches, at Sioux City, on the 2Gth; the 

 lowest was 29.58 inches, at Sioux City, on the 17th. 



Temperature. — The monthly mean for the state, 113 stations reporting, 

 was 73.7°, or 19° above the normal. The highest monthly mean was 78.1" 

 at Leon; the lowest, 68.5°, at Estherville. The highest temperature re- 

 ported in the state was 103° at Lamoni, on the 18th and the lowest was 

 40° at Elma, on the 14th, and Spencer on the 25th. The coolest days 

 were the 14th, 26th, 27th and 28th, and the highest temperatures were 

 recorded on the 8th, 16th, 17th and 22d. 



Humidity. — The average relative humidity for the state at 7 a. m. was 

 78 per cent, and at 7 p. m., 53 per cent. The mean for the month was 

 66 per cent, or about 6 per cent less than the normal. The highest 

 monthly mean was 76 per cent at Charles City, and the lowest, 61 per 

 cent at Des Moines. 



Precipitatioin'. — The average for the state, 121 stations reporting, was 

 2.19 inches, or 1.49 inches less than the normal. By sections the aver- 

 ages were as follows: Northern, 2.40 inches, or 1.08 inches less than 

 the normal; Central, 1.82 inches, or 1.95 inches less than the normal; 

 Southern, 2.35 inches, or 1.43 inches less than the normal. The greatest 

 amount reported from any station was 4.90 inches at Lake Park, and the 

 least, 0.42 inch at Webster City. The greatest amount in any 24 con- 

 secutive hours, 4.30 inches, occurred at Tipton, on the 19th. At Dubuque, 

 on the 31st, 1.03 inches fell in 15 minutes. While rain fell at some place 

 in the state on every day of the month, the showers were generally 

 light, widely scattered and of but little benefit until the 23d, when they 

 were quite general and copious. They were also quite general on the 

 27th and 31st. Measurable precipitation occurred on an average of 7 

 days, which equals the normal. 



Wind. — The prevailing direction of the wind was from the south. The 

 highest velocity recorded was 52 miles an hour, from the northwest, at 

 Sioux City on the 4th. 



Sunshine and Cloudiness. — The average percentage of the possible 

 amount of sunshine was 73 per cent, or 4 per cent more than the normal. 

 The average number of clear days was 17; partly cloudy, 10; cloudy, 4. 



