TWENTIETH ANNUAL YEAR BOOK— PART VIII 699 



northern division. There were no cool periods and the temperature was 

 normal, or below, on very few days. The hottest part of the month oc- 

 curred during the last week and values of 100°, or slightly above, were re- 

 corded at places in all divisions. 



The precipitation was deficient and unevenly distributed, ranging from 

 less than half an inch in Butler County to nearly 8.00 inches at Dubuque. 

 Most of the precipitation occurred during the first half of the month and 

 was generally ample for all needs; after the 15th of the month a dry 

 period set in that prevailed till the 31st. The dry weather in connec- 

 tion with the high temperature and strong winds that prevailed during 

 the last week of the month had a very injurious effect on all vegetation 

 and when relieved by showers on the 31st corn was beginning to fire over 

 much of the State, particularly in the central and some southwest coun- 

 ties. There were no severe wind storms during the month but one of the 

 most severe rainstorms of record occurred at Dubuque, on the 9th, 1.20 

 inches falling in 10 minutes and 2.70 inches fell in one hour. Seven per- 

 sons lost their lives by being drowned and a number severely injured. The 

 property loss was approximated at $125,000.00. See page 26. 



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

 29.98 inches. The highest pressure recorded was 30.24 inches at Dubuque 

 on the 8th, and the lowest was 29.61 at Sioux City on the 26th. The 

 monthly range was 0.62 inch. 



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

 records of 99 stations, was 77.4°, or 3.3° higher than the normal. By 

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

 Northern, 75.8°, or 3.1° higher than the normal, Central, 77.6°, or 3.3° 

 higher than the normal; Southern, 78.7°, or 3.5° higher than the normal. 

 The highest monthly mean was 81.8° at Omaha, Nebraska, and the lowest 

 was 72.4° at Postville. The highest temperature reported was 104° at 

 Webster City on the 30th and Keosauqua on the 31st; the lowest was 41 at 

 Waverly on the 16th. The Temperature range for the State was 63°. 



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

 75 per cent, and at 7 p. m. it was 52 per cent. The mean for the State was 

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

 mean was 66 per cent at Dubuque and Sioux City, and the lowest was 61 

 per cent at Omaha, Nebr. 



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

 records of 105 stations, was 2.86 Inches, or 1.10 inches less than the nor- 

 mal. By divisions the averages were as follows: Northern, 3.36 inches, 

 or 0.52 inch less than the normal; Central, 2.42 inches, or 1.56 inches less 

 than the normal; Southern, 2.79, or 1.23 inches less than the normal. The 

 greatest amount, 7.82 inches, occurred at Dubuque, and the least, 0.39 of an 

 inch at Allison. The greatest amount in 24 consecutive hours, 4.12 inches, 

 occurred at Le Mars on the 13th. 



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

 The highest velocity reported from a regular Weather Bureau Station was 

 38 miles an hour, from the west, at Sioux City on the 13th. 



