574 TWENTY-THIRD ANNUAL YEAR BOOK— PART VIII 



was 69 per cent, which is 3 per cent more than the normal. The highest 

 monthly mean was 76 per cent at Charles City, and the lowest was 64 per 

 cent at Sioux City. 



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

 the records of 100 stations, was 3.06 inches, or 0.20 inch more than the 

 normal. By divisions the averages were as follows: Northern, 3.25 inches, 

 or 0.57 inch more than the normal; Central, 3.30 inches, or 0.44 inch more 

 than the normal; Southern, 2.63 inches, or 0.42 inch less than the normal. 

 The greatest amount, 6.70 inches occurred at Algona, the least 1.04 inches, 

 occurred at Inwood. The greatest amount in any 24 consecutive hours, 

 3.72 inches, occurred at Algona, on the 11th. 



Snow. The average snowfall for the State was 1.0 inch, or 0.8 inch less 

 than the normal. Practically all the snow occurred in the northwest por- 

 tion of the State on the 11th, and only a few stations in the central and 

 southern division reported more than a trace. The greatest fall reported 

 was 10.0 inches at Spencer. 



Sunshine and Cloudiness. The average per cent of the possible amount 

 of sunshine was 53, or 7 per cent less than the normal. The per cent of 

 the possible amount at the regular Weather Bureau Stations was as fol- 

 lows: Charles City, 48; Davenport, 45; Des Moines, 52; Dubuque, 48; 

 Keokuk, 55; Sioux City, 53; Omaha, Neb., 67. 



Miscellaneous Phenomena. Aurora: 21st, 22d. Fog: 3d, 4th, 5th, 6th, 

 7th, 8th, 10th, 24th, 25th. Hail: 6th, 7th, 8th, 9th, 10th, 11th, 12th, 14th, 

 16th, 17th. Halos (lunar and solar) : 1st, 3d, 13th, 14th, 21st, 23d, 26th, 27th, 

 28th. Sleet: 10th, 11th, 13th, 17th. Thunderstorms: 3d, 6th, 7th, 8th, 

 10th, 11th, 12th, 16th, 17th, 18th, 24th. Tornado: 6th, 11th. 



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

 The highest velocity reported from a regular Weather Bureau Station was 

 at the rate of 55 miles per hour, from the northwest, at Sioux City, on the 

 19th. 



Rivers. High stages prevailed on all rivers the greater part of the 

 month, but the flood stage was not reached except on the Mississippi 

 River, where one of the worst floods in the history of the State occurred. 

 The flood was caused principally from the discharge of streams in Wiscon- 

 sin and Minnesota. 



