TWENTY-FIRST ANNUAL YEAR BOOK— PART VIII 639 



The highest monthly mean was 61.8°, at Keokuk, and the lowest was 57.0° 

 at Northwood. The highest temperature recorded was 89° at Afton, Cedar 

 Rapids and Humboldt, on the 22d, and the lowest was 29°, at Clinton and 

 Maquoketa, on the 14th. The temperature range for the state was 60". 



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

 75 per cent, and at 7 p. m., 55 per cent. The mean for the month was 65 

 per cent, or about 3 per cent below the normal. The highest monthly 

 mean was 76 per cent at Omaha, Neb., and the lowest was 58 per cent, 

 at Dubuque. 



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

 the records of 110 stations, was 3.26 inches, or 1.31 inches less than nor- 

 mal. By divisions the averages were as follows: Northern, 3.45 inches, 

 or 1.03 inches less than the normal; Central, 3.11 inches, or 1.48 inches 

 less than the normal; Southern, 3.23 inches, or 1.41 inches less than the 

 normal. The greatest amount, 5.73 inches, occurred at Keosauqua, and the 

 least, 0.63 inch, at Fort Dodge. The greatest amount in 24 consecutive 

 hours, 4.12 inches, occurred at Keosauqua on the 11th and 12th. 



Wi7id. The prevailing direction of the wind was from the southeast. 

 The average hourly velocity was 7.8 miles, or 0.9 mile less than the 

 normal. The highest velocity reported from a regular Weather Bureau 

 Station was at the rate of 46 miles an hour from the northeast, at Daven- 

 port, on the 12th. 



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

 of sunshine was 60, or about 2 per cent less than normal. The per cent 

 of the possible amount at the regular Weather Bureau Stations was as 

 follows: Charles City, 64; Davenport, 62; Des Moines, 63; Dubuque, 71; 

 Keokuk, 60; Sioux City, 52; Omaha, Neb., 51. 



Miscellaneous Phenomena. Aurora: 12th. Fog: 17th, 25th, 31st. Frost: 

 1st, 2d, 5th, 14th, 15th. Hail: 2d, 11th, 14th, 21st, 22d, 26th. Halos, lunar 

 or solar: 3d, 5th, 6th, 13th, 14th, 15th, 19th, 23d, 25th, 26th, 27th, 31st. 

 Thunderstorms:, 1st 2d, Sd, 4th, 7th, 9th, 10th, 11th, 12th, 17th, 18th, 19th, 

 20th, 21st, 22d, 23d, 26th, 27th, 31st. Rainbow: 22d, 31st. 



Rivers. Moderate stages prevailed on the Mississippi with but slight 

 fluctuations and a general falling tendency; on the Missouri moderate 

 stages prevailed until after the heavy rains of the llth-12th when a sharp 

 rise occurred with a crest stage of slightly below the flood stage at Sioux 

 City on the 16th and stages above the flood stage at Omaha on the 17th, 

 18th and 19th. The flood stage was also reached on the Des Moines River 

 from the heavy rains on the llth-12th from Tracy down. A crest of 14.4 

 feet was reached at Tracy on the 14th and 11.4 feet at Ottumwa on the 

 15th. The heavy rain of the 22d-23d caused destructive floods in the small 

 streams especially in Benton and Linn Counties and the Maquoketa River 

 was out of its banks on the 22d. 



