482 IOWA DEPARTMENT OF AGRICULTURE 



the crop made slow progress and only the earliest fields had reached 

 the roasting ear stage by the close of the month. Threshing was 80 per 

 cent finished, the yield and quality of all grains being exceptionally good 

 and that of oats being the largest of record. Late potatoes and truck 

 crops suffered somewhat from lack of moisture. Very little fall plow- 

 ing could be done. 



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

 30.01 inches. The highest recorded was 30.32 inches, at Omaha, Nebr., 

 on the 2d, and the lowest was 29.69, at Dubuque, on the 24th. The monthly 

 range was 0.63 of an inch. 



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

 records of 108 stations, was 69.4°, or 2.4° lower than the normal. By di- 

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

 lows: Northern, 68.0°, or 2.4° lower than the normal; Central, 69.6°, or 

 2.1° lower than the normal; Southern, 70.7°, or 2.5° lower than the nor- 

 mal. The highest monthly mean was 74.1°, at Mt. Ayr, and the lowest 

 was 65.4°, at Postville. The highest temperature reported was 102°, at 

 Lenox, on the 4th, and the lowest was 31°, at Matlock, on the 28th. The 

 temperature range for the State was 71°. 



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

 records of 114 stations, was 2.29 inches, or 1.39 inches less than the 

 normal. By divisions the averages were as follows: Northern, 2.21 

 inches, or 1.27 inches less than the normal; Central, 2.31 inches, or 1.46 

 inches less than the normal; Southern, 2.35 inches, or 1.43 inches less 

 than the normal. The greatest amount, 6.31 inches, occurred at Onawa, 

 and the least, 0.70 of an inch, at Davenport. The greatest amount in 

 24 hours, 2.80 inches, occurred at Olin, on the 7th. 



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

 was 80 per cent, and at 7 p. m. it was 54 per cent. The mean for the 

 month was 67 per cent, or 4 per cent lower than the normal. The high- 

 est monthly mean was 74 per cent, at Charles City, and the lowest was 

 68 per cent, at Omaha, Nebr. 



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

 The highest velocity reported from a regular Weather Bureau station 

 was at the rate of 42 miles an hour, from the east, at Sioux City, on 

 the eth. 



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

 of sunshine was 71, or about normal. The per cent of the possible 

 amount at the regular Weather Bureau stations was as follows: Charles 

 City, 60; Davenport, 72; Des Moines, 70; Dubuque, 74; Keokuk, 74; 

 Sioux City, 77; Omaha, Nebr., 72. 



Miscellaneous Phenomena. — Aurora, 8th, 9th, 14th, 15th, and 25th, those 

 of the 9th and 25th being particularly bright in some sections of the 

 State; Fog, 12th, 13th, 14th, 15th, 16th, 17th, 20th, 21st, 22d, 23d and 27th; 

 Frost, 10th, 28th, 30th; Hail, Northern Division, 19th; Central Division, 

 21st and 27th; Southern Division, 21st; Halos, (lunar or solar), 15th, 

 21st, 27th and 28th; Thunderstorms, All days except 3d, 10th, 13th, 14th, 

 15th, 16th, 18th, 24th, 28th, 29th, and 30th. 



Rivers. — The rivers fell slowly and steadily and were generally quite 

 low by the close of the month. 



