PART II. 



REPORT OF THE IOWA WEATHER AND CROP 

 SERVICE FOR 1905. 



JOHN R. SAGE, DIRECTOR 



CLLMATOLOGY OF THE YEAR 1905. 



-I 



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

 highest observed pressure was 31.09 inches on January 25th, at Sioux 

 City; lowest pressure, 29.12 inches on January 1st at Keokuk. Range 

 for the state, 1.97 inches. 



Temperature. — The mean temperature for the state was 47.3", which 

 is 0.4° below normal. The highest temperature reported was 104° on 

 August 11th at Waukee. The lowest temperature reported was 41° 

 below zero on Feb. 2nd, at Galva and Ida Grove. Range for the year 

 145°. 



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

 the year, as shown by complete records of 107 stations, was 36.51 

 inches, which is 4.79 inches above the normal, and 7.77 inches above 

 the average amount in 1904. The greatest amount recorded at any 

 station for the year was 52.26 inches at Thurman. Least amount 

 recorded 24.66 inches at Little Sioux. The greatest monthly rainfall 

 was 14.89 inches at Keosauqua in June; least monthly amount, trace 

 at Estherville, Rock Rapids in December. The greatest amount in any 

 24 consecutive hours was 12.10 inches, at Bonaparte, June 10th. The 

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

 was 97. 



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

 west. Highest velocity reported, 59 miles an hour, in Sioux City, from 

 the Northwest on May 3rd. Average daily movement, 201 miles. There 

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

 164 clear days, 97 partly cloudy, and 105 cloudy days in 1904. 



MONTHLY SUMMARIES. 



January. — The monthly mean temperature for the state, as shown 

 bv records of 118 stations, was 11.2°, which is 7.0° below normal. By 



