PART I. 



Report of the Iowa Weather and Crop Ser- 

 vice for 1907. 



Geo. M. Chappel, Director 



CLIMATOLOGY OF THE YEAR 1907. 



Baeometee. — The mean pressure of the atmosphere of the year of 1907 

 was 30.04 inches. The highest observed pressure was 30.79 inches on 

 January 22d at Charles City, Floyd county. The lowest pressure was 

 29.18 inches on November 20th at Dubuque, Dubuque county. The range 

 for the state was 1.61 inches. 



Tempeeatuee. — The mean temperature for the state was 47.6°, which 

 is the normal, for the state. The highest temperature reported was 102', 

 on July 5th, at Thurman, Fremont county. The lowest temperature 

 reported was 31° below zero on February 5th, at Washta, Cherokee county. 

 The range for the year was 133°. 



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

 year, as shown by complete records of 103 stations was 32.06 inches, which 

 is .03 of an inch above the normal, and .83 of an inch above the average 

 amount in 1906. The greatest amount recorded at any station for the 

 year was 43.90 inches at Mount Ayr, Ringgold county. The least amount 

 recorded was 19.93 inches at Sioux City, Woodbury county. The greatest 

 monthly rainfall was 13.66 inches at Belle Plaine, Benton county, in July. 

 The least monthly precipitation was .05 of an inch at Sioux City, Wood- 

 bury county, in November, and Hancock, Pottawattamie county, in Decem- 

 ber. The greatest amount in any twenty-four consecutive hours was 5.30 

 inches at Belle Plaine, in Benton county, on July 9th. The average number 

 of days on which .01 of an inch or more of fain fell was eighty-eight. 



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

 west. The highest velocity was 66 miles per hour in Sioux City, Woodbury 

 county, from the northwest on January 19th. The average daily move- 

 ment of wind was 202 miles. There were 168 clear days; 94 partly cloudy, 

 and 103 cloudy days; as against 163 clear days, 97 were partly cloudy, 

 and 105 cloudy days in 1906. 



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