480 IOWA DEPARTMENT OF AGRICULTURE 



total precipitation for those days was 5.77 inches, of which 3.65 inches 

 fell in a period of 4 hours and 5 minutes, beginning at 5 p. m. of the 21st. 



Pressure. — The mean pressure (reduced to sea level) for the State 

 was 29.92 inches. The highest recorded was 30.16 inches, at Sioux City, 

 on the 16th, and the lowest was 29.58 at Sioux City on the 13th, and at 

 Omaha, Nebr., on the 12th. The monthly range was 0.58 of an inch. 



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

 records of 101 stations, was 74.3°, or 0.2° higher than the normal. By 

 divisions, three tiers of counties to the division, the means were as fol- 

 lows: Northern, 72.6°, or 0.1° lower than the normal; Central, 74.7°, 

 or 0.4° higher than the normal; Southern, 75.7°, or 0.5° higher than the 

 normal. The highest monthly mean was 79.0°, at Omaha, Nebr., and the 

 lowest was 70.2°, at Postville. The highest temperature reported was 

 106°, at Clarinda, on the 30th; the lowest was 38°, at Rock Rapids, on the 

 3d. The temperature rahge for the State was 68°. 



Humidity. — The average relative humidity for the State at 7 a. m. 

 was 78 per cent, and at 7 p. m. it was 54 per cent. The mean for the 

 month was 66 per cent, or 1 per cent lower than the normal. The highest 

 monthly mean was 72 per cent, at Charles City, and the lowest was 57 

 per cent, at Omaha, Nebr. 



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

 the records of 111 stations, was 2.27 inches, or 1.69 inches less than the 

 normal. By divisions the averages were as follows: Northern, 3.28 

 inches, or 0.60' inch less than the normal; Central, 2.25 inches, or 1.73 

 inches less than the normal; Southern, 1.28 inches, or 2.74 inches less 

 than the normal. The greatest amount, 6.06 inches, occurred at Nora 

 Springs, and the least 0.23 of an inch at Northboro. The greatest amount 

 in 24 consecutive hours, 3.65 inches, occurred at Lansing, on the 21st. 



Wind. — The prevailing direction of the wind was from the southwest. 

 The highest velocity reported from a regular Weather Bureau station 

 was 39 miles an hour, from the north, at Sioux City, on the 11th. 



Sunshine and Cloudiness. — The average per cent of the possible amount 

 of sunshine was 81, or 8 per cent more than the normal. The per cent 

 of the possible amount at the regular Weather Bureau stations was as 

 follows: Charles City, 68; Davenport, 76; Des Moines, 90; Dubuque, 72; 

 Keokuk, 87; Sioux City, 87; Omaha, Nebr., 86. Twenty-nine stations re- 

 ported no cloudy days. 



