NINETEENTH ANNUAL YEAR BOOK— PART X 557 



cent of the normal. Much livestock was sold in the southwest counties 

 because of shortage of feed and that which remained was on winter feed 

 throughout the month. Excessive rains with unusually severe electrical 

 storms in the north and east-central counties on the 16th-17th damaged 

 shocked grain and delayed threshing. 



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

 was 29.93 inches. The highest recorded was 30.30 inches, at Dubuque, 

 on the 19th, and the lowest was 29.58 inches, at Sioux City, on the 5th. 

 The monthly range was 0.72 of an inch. 



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

 ords of 102 stations, was 76.0°, or 4.2° higher than the normal. By divi- 

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

 Northern, 72.8°, or 2.4 higher than the normal; Central, 76.1°, or 4.4° high- 

 er than the normal; Southern, 79.1°, or 5.9° higher than the normal. The 

 highest monthly mean was 80.8°, at Clarinda, Keokuk, Thurman and 

 Omaha, Nebr., and the lowest was 70.0°, at Forest City. The highest tem- 

 perature recorded was 113°, at Clarinda, Knoxville and Shenandoah, on 

 the 4th, and the lowest was 38°, at Sibley, on the 30th. The temperature 

 range for the State was 75°. 



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

 normal. By divisions the averages were as follows: Northern, 4.32 

 records of 112 stations, was 3.61 inches, 0.07 of an inch less than the 

 inches, or 0.84 of an inch more than the normal; Central, 2.97 inches, or 

 0.80 of an inch less than the normal; Southern, 3.55 inches, or 0.23 of an 

 inch less than the normal. The greatest amount 8.38 inches, occurred at 

 Centerville, and the least, 0.54 of an inch, at Thurman. The greatest 

 amount in 24 hours 5.22 inches, occurred at Dubuque on the 16th-17th. 



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

 77 per cent, and at 7 p. m. it was 58 per cent. The mean for the month 

 was 67 per cent, or 4 per cent lower than the normal. The highest 

 monthly mean was 76 per cent, at Charles City, and the lowest was 56 

 per cent, at Omaha, Nebr. 



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

 The highest velocity reported from a regular Weather Bureau station 

 was at the rate of 51 miles an hour, from the south, at Sioux City, on the 

 15th. 



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

 68, or 3 per cent less than the normal. The per cent of the possible amount 

 at the regular Weather Bureau stations was as follows: Charles City, 63; 

 Davenport, 69; Des Moines, 62; Dubuque, 66; Keokuk, 76; Sioux City, 68; 

 Omaha, Nebr., 70. 



Miscellaneous Phenomena. Aurora, 17th, 24th, 25th, 26th and 31st. Fog, 

 9th, 14tb, 16th, 24th, 27th and 28th. Frost, (light) : 31st, at Mt. Ayr. Hail: 

 14th, 17th, 22d, 29th and 30th. Halo, Solar: 27th. Rainbow: 22d. Thun- 

 derstorms. All days except 5th, 9th, 24th, 25th, 26th, 27th and 31st. 



Rivers. Moderate stages prevailed on the Missouri River, with a gen- 

 eral falling tendency the greater portion of the month; on the Mississippi 

 low stages prevailed, with a falling tendency, until the 17th, when a sharp 

 rise, due to unusually heavy rainfall over the northeastern portion of the 



