PART 11. 



Report of the Iowa Weather and Crop Ser- 

 vice for 1906. 



John R. Sage, Director. 



CLIMATOLOGY OF THE YEAR 1906. 



Barometek. — The mean pressure of the atmosphere for the year 1906 

 was 30.05 inches. The highest observed pressure was 30.79 inches on 

 February 5th at Dubuque. The lowest pressure was 28.71 inches on 

 January 3d at Dubuque. The range for the State was 2.08 inches. 



Temperature. — The mean temperature for the State was 48.7°, which 

 is 1° above the normal. The highest temperature reported was 102° on 

 July 21st, at Atlantic. The lowest temperature reported was 32° below 

 zero on February 10th, at Inwood, Lyon county. The range for the 

 year was 134°. 



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

 year, as shown by complete records of 107 stations, was 31.23 inches, 

 which is .49 of an inch below the normal, and 5.28 inches below the 

 average amount in 1905. The greatest amount recorded at any station 

 for the year was 44.34 inches at Ridgeway, Winneshiek county. The 

 least amount recorded was 20.63 inches at Elliott, Montgomery county. 

 The greatest monthly rainfall was 11.10 inches at Thurman in Septem- 

 ber. The least monthly precipitation was 0.20 of an inch at Baxter 

 and Sibley in February. The greatest amount in any twenty-four con- 

 secutive hours was 7.60 inches at Thurman on September 16th and 17th. 

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

 fell was ninety-two. 



Wind and Weather. — The prevailing direction of wind was northwest. 

 The highest velocity reported was fifty-eight miles per hour in Sioux 

 City, from the northwest on March 21st. The average daily movement 

 of wind was 205 miles. There were 163 clear days; 97 partly cloudy, and 

 105 cloudy days; as against 164 clear days, 98 partly cloudy and 103 

 cloudy days in 1905. 



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