SEVENTEENTH ANNUAL YEAR BOOK— PART X 525 



At this time fruit trees were beginning to bloom and trees were leafing out 

 as far north as central Iowa. 



On the evening of the 19th the north-central part of the state was 

 A'isited by a severe wind, rain and electrical storm. In Wright County 

 the disturbance assumed tornadic character, houses being moved from 

 their foundations and otherwise damaged, while a number of outbuildings 

 were destroyed. Hail accompanied the storm, some of the stones meas^ 

 uring an inch in diameter, and the ground was covered to a depth, of 

 eight-tenths of an inch. Fruit trees were severely injured by the hail. 

 No persons are known to have been killed as a result of this storm. 



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

 29.98 inches. The highest recorded was 30.44 inches, at Sioux City, on 

 the 6th, and the lowest was 29.33, at Des Moines and Sioux City, on the 

 19th. The monthly range was 1.11 inches. 



Temperature. — The mean temperature for the state, as shown by the 

 records of 105 stations, was 47.1°, or 1.6° lower than the normal. By 

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

 follows: Northern, 45.1°, or 1.6° lower than the normal; Central, 47.5°, 

 or 1.4° lower than the normal; Southern, 48.8°, or l.S° lower than the 

 normal. The highest monthly mean was 50.8°, at Keokuk, and the lowest 

 was 42.4°, at Estherville. The highest temperature reported was 90°, at 

 Clarinda and Northboro, on the 12th, and the lowest was 11°, at Matlock, 

 on the 6th. The latter is a recently opened station in Sioux County, 

 in the extreme northwestern part of the state. The temperature range 

 for the state was 79°. 



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

 78 per cent, and at 7 p. m. it was 58 per cent. The mean for the month 

 was 68 per cent, or practically the normal. The highest monthly mean 

 was 75 per cent, at Charles City, and the lowest was 64 per cent, at 

 Dubuque. 



Precipitation. — The average precipitation for the state as shown by 

 the records of 113 statiorts, was 2.62 inches, or 0.24 of an inch less than 

 the normal. By divisions the averages were as follows: Northern, 2.94 

 inches, or 0.26 of an inch more than the normal; Central, 2.38 inches, 

 or 0.48 of an inch less than the normal; Southern, 2.54 inches, or 0.51 

 of an inch less than the normal. The greatest amount, 5.92 inches, 

 occurred at Nora Springs, and the least was 1.13 inches, at Sioux City. 

 The greatest amount in any 24 consecutive hours, 2.00 inches, occurred at 

 belmond, on the 19th. 



Snoicfall. — The average snowfall for the state was 1.1 inches, or 0.7 of 

 an inch less than the normal. The greatest amount, 6.0 inches, occurred 

 at Rockwell City, while 7 stations reported none whatever. 



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

 The highest velocity reported from a regular Weather Bureau station 

 was 48 miles an hour from the northwest, at Sioux City, on the 16th. 



Sunshine and Cloudiness. — The average percent of the possible amount 

 of sunshine was 55, or about 4 per cent lower than the normal. The per 

 cent of the possible amount at the regular Weather Bureau stations wafi 



