PART II. 



REPORT OF THE IOWA WEATHER AND CROP 

 SERVICE FOR J 904. * 



WITH MAP SHOWING IOWA'S CORN CROP FOR 

 PAST TEN YEARS. 



John R. Sage, Director. 



METEOROLOGICAL SUMMARY FOR THE YEAR 1904, 



Barometer.— The mean pressure for the year was 30.04 inches. The 

 highest observed pressure was 30.85 inches, on February 10th, at Sioux 

 City; lowest pressure, 29.09 inches, on December 27th, at Dubuque. Range 

 for the State, 1.76 inches. 



Temperature.— The mean temperature for the State was 46.3% which 

 is 0.4' below normal. The highest temperature reported was 100% on July 

 17th, at Marshalltown. The lowest temperature reported was 32' below 

 zero, on January 27th, at Elkader and Fayette. Range for the year, 132% 



Precipitation. — The average amount of rain and melted snow for the 

 year, as shown by complete records of 96 stations, was 28.74 inches, which 

 is 2,68 inches below the normal, and 6.92 inches below the average amount 

 in 1903. The greatest amount recorded at any station for the year was 38.93 

 inches, at Keokuk. Least amount recorded 19.34 inches, at Vinton. The 

 greatest monthly rainfall was 11.97 inches, at Thurman, in July; least 

 monthly amount, none, at Rockwell City, in November. The greatest 

 amount in any 24 consecutive hours was 7.73 inches, at De Soto, July 19th. 

 The average number of days on which .01 of an inch or more of rain fell 

 was 75. 



Wind and Weather. — The prevailing direction of the wind was north- 

 west. Highest velocity reported, 68 miles an hour, in Sioux City, from the 

 northwest on March 2d. Average daily movement, 216 miles. There were 

 164 clear days, 97 partly cloudy, and 105 cloudy days; as against 156 clear 

 days, 100 partly cloudy, and 109 cloudy days in 1903. 



