FIFTEENTH ANNUAL YEAR BOOK— PART XI 765 



work had been practically completed. At the same time threshing was 

 well advanced. The soil was too dry for plowing, and pastures were 

 cut short by the drouth, especially in southern counties. In some places 

 stock had to go on feed. Reports of wells going dry came from several 

 sections. 



Pbessube. — The mean sea level pressure for the State was 29.98 inches. 

 The highest recorded was 30.27 inches, at Dubuque, on the 29th; the 

 lowest was 29.56 inches, at Des Moines, on the 16th. 



Temperature. — The monthly mean for the State, 107 stations reporting, 

 was 76.6°, or 2.5° higher than the normal. An excess of temperature 

 prevailed at all stations, but the departures were greatest in southern 

 sections. Burlington, with a mean temperature of 80.6° was the warm- 

 est point in the State, and Elma, with a mean of 72.4°, the coolest. 



Most of the highest monthly temperatures at the individual stations 

 occurred on the 11th, 12th or 27th. In general these values were slightly 

 above 100° over the southern half of the State, and slightly below 100° 

 over the northern half. The highest temperature reported was 109°, at 

 Centerville, on the 12th. The next highest was 106°, at Bedford, on 

 the 27th. The weather was coolest at the beginning and close of the 

 month, and on or about the 18th. About 90 per cent of the lowest 

 monthly temperatures at the various stations occurred at the last men- 

 tioned time. The lowest reported was 43°, at Washta, on the 3d, and 

 at Mason City, on the 18th. 



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

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

 65 per cent, or about 3 per cent less than the normal. The highest 

 monthly mean was 72 per cent, at Cliarles City, and the lowest, 62 per 

 cent, at Davenport. 



Precipitation. — The average for the State, 114 stations reporting, was 

 2.27 inches, or 1.69 inches less than the normal. Only 4 other Julies 

 since 1889 have been drier. The precipitation was deficient over 90 

 per cent of the State, but the Central Section was driest. There were 

 two chief areas where there was an excess of moisture, one covering 

 most of Pocahontas, Calhoun, Sac and Crawford counties, the other, 

 Mahaska, Monroe, Wapello, Wayne, Appanoose and Davis counties. The 

 greatest amount reported was 6.50 inches, at Oskaloosa, and , the least, 

 0.44 inch, at Davenport. In point of time the precipitation of the month 

 was exceptionally well distributed. The 6th, 12th, 16th, 24th and 30th 

 were the dates of most general occurrence. There was an average of 5 

 rainy days for each station, this being 3 fewer than the normal. 



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

 highest velocity recorded was 35 miles an hour, from the north, at 

 •Sioux City, on the 16th. The velocities were among the lightest of 

 record for July. 



Sunshine and Cloudiness. — The average percentage of the possible 

 amount of sunshine was 81, or about 9 per cent more than the normal. 

 The average number of clear days was 20; partly cloudy, 8; cloudy, 3. 



