THIRTEENTH ANNUAL YEAR BOOK— PART I 15 



the crop was only a few points below the average of past years on July 

 31. All of the crop is strong and vigorous and gives promise of a large 

 yield. Potatoes and pastures were generally in good condition. 



Temperature. — The monthly mean temperature for the State, as shown 

 by the records of 116 stations, was 74.6°, or 1.2° above the normal for 

 Iowa. By sections the means were as follows: Northern, 72.7°, or 0.6° 

 above the normal; Central, 74.7°, or 1.0° above the normal; Southern, 

 76.5°, or 2.0° above the normal. The highest monthly mean was 78.7°, at 

 Northboro, Page County; and the lowest mean was 70.0°, at Sibley, 

 Osceola County. The highest temperature was 103°, at Little Sioux, 

 Harrison County, on the 14th, and at Clarinda, Page County, on the same 

 date; the lowest temperature reported was 38° at Rock Rapids, Lyon 

 County, on the 17th. The average monthly maximum was 98°, and the 

 average monthly minimum, 49°. The greatest daily range was 44°, at 

 Decorah, Winneshiek County, and at Spencer, Clay County. The average 

 of the greatest daily ranges was 36°. 



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

 the records of 123 stations, was 3.71 inches, or 0.73 inch less than the 

 normal. By sections the averages were as follows:: Northern, 4.68 

 inches, or 0.40 inch more than the normal; Central, 3.60 inches, or 0.91 

 inch less than the normal; Southern, 2.85 inches, or 1.69 inches less than 

 the normal. The greatest amount, 7.56 inches, occurred at Grand Meadow, 

 Clayton County, and at Guthrie Center, Guthrie County; and the least, 

 1.17 inches, at Greenfield, Adair County. The greatest amount in 24 con- 

 secutive hours, 3.43 inches, occurred at V/ashington, Washington County, 

 on the 20th. Measurable precipitation occurred on an average of 10 days. 



Sunshine and Cloudiness. — The average number of clear days was 17; 

 partly cloudy, 10; cloudy, 4. The duration of sunshine was about that 

 usually experienced, the percentage of the possible amount being 76 at 

 Davenport, SO at Des Moines, 75 at Dubuque, 72 at Keokuk, and 71 at 

 Sioux City. 



Wind. — ^South winds prevailed. The highest velocity reported was 40 

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

 the 14th. 



JULY NORMALS FOR IOWA, 1890-1912. 



Normal temperature for July, 73.6°. 



Warmest July, 1901, with mean temperature of 82.4°. 



Coldest July, 1891, with mean temperature of 68.5°. 



Normal July precipitation, 3.95 inches. 



Wettest July, 1902, with total precipitation of 8.67 inches. 



Driest July, 1894, with total precipitation of 0.63 inch. 



Average number of days with 0.01 inch or more of precipitation, 8. 



Prevailing direction of wind, southwest. 



Average number of clear days, 17; partly cloudy, 10; cloudy, 4. 



