EL E V E N T 1 1 A N N UAL YEA K J JOO K PA UT I 2 1 



them section, 30.9°, which is 2.8° below the normal; Central section. 

 33.5°, which is 2.2° below the normal; Southern section, 35.9° which is 

 2.3° below the normal. The highest monthly mean was 38.4 °, at Coun- 

 cil Bluffs, Pottawattamie County, and the lowest monthly mean, 28.0°, 

 at Estherville, Emmet County. The highest temperature reported was 

 76°, at Council Bluffs, Pottawattamie County, on the 8tti; the lowest 

 temperature reported was 5°, at Jefferson, Greene county, on the 3d. 

 The average monthly maximum was 61°, and the average monthly mini- 

 mum was 12°. The greatest daily range was 54°, at Council Bluffs, 

 Pottawattamie County. The average of the greatest daily ranges was 

 35°. 



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

 the records of 121 stations, was 0.34 inch, which is 1.05 inches below the 

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

 0.22 inch, which is 1.09 inches below the normal; Central section, 0.35 

 inch, which is 1.08 inches below the normal; Southern section, 0.45 inch, 

 which is 0.99 inch below the normal. The greatest amount, 1.03 inches, 

 occurred at Cumberland, Cass County, and the least, a trace at Carroll. 

 Carroll County, Chariton, Lucas County, Denison, Crawford County. 

 Forest City, Winnebago County, Sac City, Stuart, Guthrie County, and 

 at Whitten, Hardin County. The greatest amount in twenty-four hours, 

 1.02 inches, occurred at Cumberland, Cass County, on the 4th. Measur- 

 able precipitation occurred on an average of 3 days. 



Snow. — The average depth of unmelted snowfall was 0.7 inch. The 

 greatest depth was 3.8 inches, at Ridgeway, Winneshiek County; 18 of 

 the 121 reporting stations had no snow during the month. 



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

 13; partly cloudy, 9; cloudy, 8. The duration of sunshine was slightly be- 

 low the normal, the precentage of the possible amount being 47 at Charles 

 City; 45 at Davenport; 56 at Des Moines; 50 at Dubuque; 44 at Keokuk; 

 and 56 at Sioux City. 



Wind. — Northwest winds prevailed. The highest velocity reported was 

 49 miles per hour from the southeast, at Sioux City, Woodbury County. 

 on the 3d. 



Thunderstorms occurred as follows: At Pacific Junction on the 20th: 

 at Clinton, Fort Madison, and at Ridgeway on the 26th; at Amana, Dela- 

 ware, Elkader, Grand Meadow, and at Independence, on the 27th: and, 

 at Dubuque on the 26th and 27th. 



DECEMBER. 



December, 1910, will go on record as the driest month of that name on 

 record since state-wide observations began in 1890. The average precipi- 

 tion was only 0.37 inch, which is O.S'2 inch below the normal and 1.81 inches 

 less than the average amount in December, 1909. Except over the south- 

 eastern counties where rain fell on the 28th or 29th, nearly all of the pre- 

 cipitation was in the form of snow and most of it fell on the 5th, 6th, 9th, 



