474 IOWA DEPARTMENT OF AGRICULTURE 



backward, coming into full bloom in the southern counties about the 15th 

 and in the northern counties about the 25th, but over most of the state 

 the prospect is good. 



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

 was 29.96 inches. The highest recorded was 30.42 inches, at Sioux City, 

 on the 14th, and the lowest was 29.36, at Sioux City, on the 26th. The 

 monthly range was 1.06 inches. 



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

 record of 108 stations, was 55.1°, or 5.4' lower than the normal. By di- 

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

 lows: Northern, 53.8°, or 5.2° lower than the normal; Central, 55.4°, or 

 5.3° lower than the normal; Southern, 56.0°, or 5.7° lower than the nor- 

 mal. The highest monthly mean was 58.1°, at Keokuk, and the lowest 

 52.2°, at Estherville. The highest temperature reported was 95° at Tip- 

 ton, on the 18th, and the lowest was 25° at Chariton, on the 5th. The 

 temperature range for the State was 70°. 



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

 73 per cent, and at 7 p. m. it was 52 per cent. The mean for the month, 

 63 per cent, is about 4 per cent below the normal. The highest monthly 

 mean was 65 per cent, at Keokuk, and the lowest was 60 per cent, at 

 Sioux City. 



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

 the records of 115 stations, was 3.87 inches, or 0.70' inch less than the 

 normal. By divisions the averages were as follows: Northern, 3.87 

 inches, or 0.61 inch less than the normal; Central, 3.80 inches, or 0.79 inch 

 less than the normal; Southern, 3.95 inches or 0.69 inch less than the 

 normal. The greatest amount, 7.33 inches, occurred at Iowa City, and 

 the least, 1.69 inches, at Rockwell City. The greatest amount in 24 con- 

 secutive hours, 3.05 inches, occurred at Glenwood, on the 21-22d. 



Snowfall. — The average snowfall for the State was 0.6 inch, or 0.5 

 Inch more than the normal, and in the 26 Mays of record has been ex- 

 ceeded only in 1907 and 1911. 



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

 The highest velocity reported from a regular Weather Bureau station 

 was at the rate of 54 miles an hour from the west, at Sioux City, on the 

 18th. 



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

 of sunshine was 62, or about 1 per cent more than the normal. The per 

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

 follows: Charles City, 58; Davenport, 59; Des Moines, 58; Dubuque, 65; 

 Keokuk, 68; Sioux City, 59; Omaha, Neb., 68. 



Miscellaneous Phenomena. — Dense Fog, 14th; Hail, 9th, 10th, 18th, 21st, 

 26th; Halos, solar or lunar, 2d, 9th, 11th, 18th, 19th, 25th, 28th, 30th; 

 Haze was more or less prevalent from the 8th till near the close of the 

 month, being most noticeable on the 13th, 14th and 16th, when it was 

 sufficiently dense to obscure objects less than a mile distant and give 



