18 IOWA DEPARTMENT OF AGRICULTURE 



County, and the lowest monthly mean, 58.6°, at Estherville, Emmet Coun- 

 ty. The highest temperature reported was 99°, at Creston, Union County, 

 on the 15; the lowest temperature reported was 30°, at Sheldon, O'Brien 

 County, on the 27th; and at Woodburn, Clarke County, on the 10th. The 

 average monthly maximum was S'8°, and the average monthly minimum 

 was 36°. The greatest daily range was 49°, at Creston, Union County; and 

 at Corning, Adams County. The average of the greatest daily ranges was 

 38°. 



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

 the records of 122 stations, was 3.59 inches, which is 0.18 inch above the 

 normal. By sections the averages were as follows: Northern section, 2.90 

 inches, which is 0.51 inch below the normal; Central section, 4.04 inches, 

 which is 0.80 inch above the normal; Southern section, 3.84 inches, which 

 is 0.27 inch above the normal. The greatest amount, 7.43 inches, occurred 

 at Afton, Union County, and the least, 1.18 inches, at Elma, Howard 

 County. The greatest amount in twenty-four hours, 3.76 inches, occurred 

 at Afton, Union County, on the 16th. Measurable precipitation occurred 

 on an average of 9 days. 



Sunshine and Cloudiness. — The average number of clear days was 

 14; partly cloudy, 7; clody, 9. The duration of sunshine was slightly be- 

 low the normal, the percentage of the possible amount being 67 at 

 Charles City; 63 at Davenport; 53 at Des Moines; 54 at Dubuque; 50 at 

 Keoukuk; and 60 at Sioux City. 



Wind. — South winds prevailed. The highest velocity reported was 39 

 miles per hour from the northwest, at Sioux City, Woodbury County, on 

 the 4th. 



OCTOBER. 



October, 1910, was unusually warm and pleasant even for Iowa where 

 Indian Summer weather generally prevails at that time of the year. It 

 was the warmest October since 1900 and the driest since 1895, and there 

 have been only three warmer months of that name during the past 21 

 years. With the exception of light showers between the 3d and 5th, clear 

 and generally warm weather prevailed until the 18th with 4 partly 

 cloudy and only 6 cloudy days during the month. The 2d was generally 

 the warmest day, but at a few stations the highest temperature for the 

 month was recorded on the 10, 11, 15 or 16th. A cool wave passed over 

 the state on the 6th and 7th that caused light frost in all sections and 

 freezing temperatures at some stations in the extreme northern counties, 

 but no damage resulted to crops. The temperature was abnormally high 

 between the 11th and 18th. during which time the daily maximum tem- 

 peratures were very near or above 80° in all parts of the state and the 

 weather was clear and balmy. Light rain began in the western counties 

 during the late afternoon of the ISth, spreading over the state on the 

 19th, 20th and 21st, with a decided drop in temperature which resulted 

 in freezing temperatures and killing frosts in northern and western coun- 

 ties on the 22d and heavy frost over the southeastern counties, but the 



