594 TWENTY-THIRD ANNUAL YEAR BOOK— PART VIII 



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

 77 per cent, and at 7 p. m. it was 53 per cent. The mean for the month 

 was 65 per cent, or 6 per cent less than the normal. The highest monthly 

 mean was 74 per cent at Charles City, and the lowest was 59 per cent at 

 Sioux City. The lowest observed was 20 per cent at Keokuk on the 11th, 

 and Sioux City on the 24th. 



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

 records of 103 stations, was 1.81 inches, or 65 inch less than the normal. 

 By divisions, the averages were as follows: Northern, 2.06 inches, or 0.28 

 inch less than the normal; Central, 1.66 inches, or 0.83 inch less than the 

 normal; Southern, 1.70 inches, or 0.84 inch less than the normal. The 

 greatest amount, 3.93 inches, occurred at Fayette, and the least 0.06 inch, 

 at Davenport (Pine Acres). The greatest amount in 24 consecutive 

 hours, 2.75 inches, occurred at Fayette, on the 6th and 7th. 



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

 of sunshine was 72, or 12 per cent greater than the normal. The per cent 

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

 follows: Charles City, 68; Davenport, 70; Des Moines, 72; Dubuque, 69; 

 Keokuk, 71; Sioux City, 77, Omaha, Nebr., 75. 



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

 The highest velocity reported from a regular Weather Bureau station was 

 at the rate of 42 miles per hour, from the northwest, at Sioux City on the 

 16th. 



Snow. A few light snow flurries occurred in each division, but no 

 station reported more than a trace. 



Miscellaneous Phenomena. Fog: 1st, 2d, 3d, 9th, 10th, 14th, 15th, 16th, 

 26th 31st. Frost (Killing): 9th, 12th, 15th, 17th, 18th. Hail: 11th. 

 Halos (Lunar and Solar): 3d, 4th, 27th, 28th. Sleet: 13th. Thunder- 

 storms. 6th, 7th, 8th, 10th, 13th, 14th, 16th, 20th, 21st, 22d, 30th and 31st. 



Rivers. Low and nearly stationary stages prevailed on all the rivers 

 of the State. At most places along the principal rivers the extreme varia- 

 tions of the stages were less than half a foot. 



