NINETEENTH ANNUAL YEAR BOOK— PART X 559 



The garden vegetable season was shortened about three weeks. The 

 dry weather favored the maturing of corn but interfered considerably 

 with the seeding and germination of wheat and rye. Where the moisture 

 was sufficient these crops were up and growing nicely at the close of the 

 month. 



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

 was 30.09 inches. The highest recorded was 30.51 inches at Dubuque, on 

 the 10th, and the lowest was 29.70 at Davenport, on the 14th. The monthly 

 range was 0.81 inch. 



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

 ords of 96 stations was 58.6°, or 4.8° lower than the normal. By divisions, 

 three tiers of counties to the division, the means were as follows: North- 

 ern, 56.7°, or 5.1° lower than the normal; Central, 58.5°, or 5.0° lower than 

 the normal; Southern, 60.5° or 4.5° lower than the normal. The highest 

 monthly mean was 62.4°, at Omaha, Nebr., and the lowest 54.0°, at Post- 

 ville. The highest temperature reported was 93° at Omaha, Nebr., on the 

 18th, and the lowest, 21° at Denison, on the 21st. The temperature range 

 for the State was 73°. 



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

 79 per cent and at 7 p. m. 58 per cent. The mean for the month was 68 

 per cent, which is 6 per cent below normal. The highest monthly mean 

 was 83 per cent at Charles City, and the lowest was 69 per cent at Omaha, 

 Nebr. 



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

 records of 108 stations, was 1.87 inches, or 1.49 inches below the normal. 

 By divisions the averages were as follows: Northern, 1.83 inches, or 1.22 

 inches less than the normal; Central, 1.46 inches, or 2.00 inches less than 

 the normal; Southern, 2.32 inches, or 1.24 inches less than the normal. 

 The greatest amount, 4.62, occurred at Keosauqua, and the least, 0.48 inch, 

 at Cumberland. The greatest amount in 24 consecutive hours 2.82 inches, 

 occurred at Keosauqua, on the 2d. 



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 34 miles an hour from the northwest at Sioux City, on the 

 11th, and at Des Moines from the southwest, on the 17th. 



Sunshine. The average per cent of the possible amount of sunshine 

 was 63, which is normal. The per cent of the possible amount at regular 

 Weather Bureau stations was as follows: Charles City, 61; Davenport, 56; 

 Des Moines, 60; Dubuque, 55; Keokuk, 75; Sioux City, 65; Omaha, Nebr., 

 68. 



Miscellaneous Phenomena. Aurora, 1st, 21st, 29th, 30th. Fog, dense, 

 8th, 11th, 12th, 14th, 25th, 27th. Frost, killing. Northern Division, 12th, 

 16th, 17th, 18th, 19th, 20th, 21st; Central Division, 17th, 18th, 20th, 21st, 

 27th; Southern Division, 17th, 20th, 21st. Hail, 10th, 11th, 18th, 19th, 20th. 

 Halo (lunar or solar) 17th. Thunderstorms, 1st, 2d, 9th, 10th, 11th, 12th, 

 14th, 15th, 17th, 18th, 19th, 24th, 25th. 



