FIFTEENTH ANNUAL YEAR BOOK— PART XI 769 



considerable damage done in sonae localities by wind squalls and ex- 

 cessively heavy rainfall. The long, severe drought of July and August 

 was thoroughly broken and at the close of the month the pastures were 

 as green as in May or June; much fall plowing had been done under 

 favorable conditions; the water supply was replenished, and a large 

 acreage of winter wheat had been seeded. 



Pressure. — The mean sea level pressure for the State was 30.07 inches. 

 The highest recorded was 30.44 inches, at Dubuque, on the 9th; the lowest 

 was 29.59 inches, at Omaha, Neb., on the 13th. 



Temperature. — The monthly mean for the State, 103 stations reporting, 

 was 64.5°, or 1.1° above the normal. By sections the mean temperatures 

 were as follows: Northern, 63.1°, or 1.3° above normal; Central, 64.5°, or 

 1.0° above normal; Southern, 65.9°, or 0.9° above the normal. The highest 

 monthly mean was 67.8°, at Northboro, and the lowest monthly mean was 

 59.8° at Estherville. The highest temperature reported in the State was 

 99°, at Clarinda and Northboro, on the 5th, and the lowest was 30°, at 

 Washta, on the 30th. 



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

 85.8 per cent, and at 7 p. m., 67.2 per cent. The mean for the month was 

 76.5 per cent, or about 3 per cent more than the normal. The highest 

 monthly mean was 84 per cent at Cliarles City, and the lowest, 73.3 per 

 cent, at Omaha, Neb. 



Precipitatiox. — The average for the State, 111 stations reporting, was 

 7.88 inches, or 4.52 inches more than the normal. By sections the aver- 

 ages were as follows: Northern, 5.84 inches, or 2.79 inches more than 

 the normal; Central, 8.38 inches, or 4.92 inches more than the normal; 

 Southern, 9.41 inches, or 5.85 inches more than the normal. The greatest 

 amount reported from any station was 16.24 inches, at Lenox, Taylor 

 county, and the least, 2.48 inches, at Lake Park, Dickinson county. The 

 greatest amount in any 24 consecutive hours, 7.78 inches, occurred at 

 Cedar Rapids, Linn county, on the 14th. At Des Moines, on the 16th, .18 

 inch fell in 5 minutes; .58 inch in 10 minutes; .81 inch in 15 minutes; 

 .95 inch in 20 minutes; 1.02 inches in 25 minutes; 1.21 inches in 35 

 minutes; 1.56 inches in 40 minutes; 1.68 inches in 45 minutes; 1.80 inches 

 in 50 minutes; 1.98 inches in one hour; 2.37 inches in one hour and 20 

 minutes, and 3.24 inches fell in one hour and 40' minutes. This was one 

 of the heaviest rainfalls of record but does not quite equal the record 

 for the station. On June 24, 1879, 3.00 inches of rain fell in one hour, 

 and on July 14-15, 1907, 3.22 inches fell in one hour and 30 minutes. 

 Measurable precipitation occurred on an average of 10 days. 



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

 greatest velocity recorded was at the rate of 43 miles per hour from the 

 southwest, at Sioux City, on the 13th. 



Sunshine and Cloudiness. — The average percentage of the possible 

 amount of sunshine was 68 per cent, or about 5 per cent more than the 

 normal. The average number of clear days was 16; partly cloudy, 7; 

 cloudy, 7. 



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