704 IOWA DEPARTMENT OF AGRICULTURE 



A small tornado occurred in Butler County on the afternoon of the 

 4th. It originated several miles north of Dumont and moved southeast 

 striking the edge of Bristow, the length of the path being less than ten 

 miles and the width varying from about 20 feet to more than 1,000 feet. 

 No lives were lost but there was considerable property damage, the build- 

 ings and live stock damage being about 12,000 and the loss to crops about 

 $25,000. A severe wind and hail storm occurred on the morning of the 

 6th in Blackhawk County, in the extreme eastern portion. A number of 

 barns were blown down and in one 17 head of stock were killed by the 

 hay loft falling in; wind towers were bent to the ground, trees uprooted 

 and broken off by the wind and considerable corn was stripped by the hail. 



Pressure. The mean pressure (reduced to sea level) for the State was 

 29.97 inches. The highest recorded was 30.31 inches, at Dubuque, on the 

 10th, and the lowest was 29.59 inches, at Sioux City, on the 3d. The 

 monthly range was 0.72 of an inch. 



Temperature. The mean temperature for the State, as shown by the 

 records of 104 stations, was 71.5°, or 0.3° lower than the normal. By divi- 

 sions, three tiers of counties to the division, the means were as follows: 

 Northern, 70.3°, or 0.1° lower than the normal; Central, 71.5°, or 0.2° lower 

 than the normal; Southern, 72.8°, or 0.4° lower than the normal. The 

 highest monthly mean was 75.0°, at Omaha, Nebr., and the lowest was 67.8°, 

 at Postville. The highest temperature recorded was 103° at Clarinda on 

 the 6th, and the lowest was 38°, at Inwood, Rock Rapids and Washta, on 

 the 31st. The temperature range for the State was 65°. 



Precipitation. The average precipitation for the State, as shown by the 

 records of 111 stations, was 2.59 inches, or 1.09 inches less than the normal. 

 By divisions the averages were as follows: Northern, 2.30 inches, or 1.18 

 inches less than the normal; Central, 2.98 inches, or 0.79 of an inch less 

 than the normal; Southern, 2.50 inches, or 1.28 inches less than the normal. 

 The greatest amount, 5.72 inches, occurred at Maquoketa, and the least, 0.97 

 mch, at Sioux Center. The greatest amount in 24 hours, 2.98 inches, oc- 

 curred at Cedar Rapids, on the 5th. 



Humidity. The average relative humidity for the State at 7 a. m. was 80 

 per cent, and at 7 p. m. it was 56 per cent. The mean for the month was 

 68 per cent, or 4 per cent lower than the normal. The highest monthly 

 mean was 71 per cent, at Charles City, and the lowest was 64 per cent, at 

 Keokuk. 



Wind. The prevailing direction of the wind was from the northwest. 

 The highest velocity reported from a regular Weather Bureau station was 

 at the rate of 38 miles an hour, from the west, at Sioux City, on the 3d. 



Sunshine. The average per cent of the possible amount of sunshine was 

 77, or 6 per cent more than the normal. The per cent of the possible 

 amount at the regular Weather Bureau stations was as follows: Charles 

 City, 85; Davenport, 70; Des Moines, 72; Dubuque, 83; Keokuk, 84; Sioux 

 City, 71; Omaha, Neb., 73. 



Miscellaneous Phenomena. Aurora, l8th. Fog, 5th, 6th. Frost (light), 

 3l8t, at Alton, Fayette and Rock Rapids. Hail, 4th, 5th, 6th, 12th, 24th. 



