TWENTT-FIRST ANNUAL YEAR BOOK— PART VIII 647 



greatest amount, 8.52 inches occurred at Britt, and the least 0.44 inch, at 

 Burlington. The greatest amount in 24 hours, 4.17 inches, occurred at 

 Humboldt, on the 20th. 



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

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

 was 70 per cent, or 2 per cent lower than the normal. The highest monthly- 

 mean was 74 per cent, at Charles City and Dubuque, and the lowest was 

 66 per cent at Keokuk. 



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 39 miles per hour, from the northwest, at Sioux City, on 

 the 6th. 



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

 69, or 2 per cent less than the normal. The per cent of the possible amount 

 at the regular Weather Bureau Stations was as follows: Charles City, 64; 

 Davenport, 73; Des Moines, 71; Dubuque, 65; Keokuk, 71; Sioux City, 73; 

 Omaha, Neb., 66. 



Miscellaneous Phenomena. Aurora, 21st. Fog, 4th, 6th, 8th, 9th, 14th, 

 15th, 20th, 24th. Frost, (light), 23d, 24th, 25th. Hail, 6th, 7th, 8th, 30th. 

 Halos (lunar or solar), 7th, 10th, 22d, 28th, 30th, 31st. Haze, 16th. Rain- 

 bow, 19th. Thunderstorms, 3d, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, 

 15th, 19th, 20th, 21st, 22d, 27th, 28th, 29th, 30th, 31st. 



Rivers. Except for a few slight and unimportant rises, moderate, fall- 

 ing stages prevailed on the principal rivers. On the main streams of the 

 interior rivers no unusually high stages prevailed but on the smaller 

 streams in Carroll, Greene, Humboldt and Hancock County local floods 

 occurred following the heavy rains of the 19th-20th. 



