18 IOWA DEPARTMENT OF AGRICULTURE 



Wind. — Northwest M'inds prevailed. The highest velocity reported was 

 39 miles per hour from the northwest, at Sioux City, Woodbury County, 

 on the 3d. 



NOVEMBER. 



As a whole, November, 1911, was cold and cloudy, the mean tempera- 

 ture being 29.9°, which is only 0.3° higher than the mean for November, 

 1896, which is the lowest November mean on record. The weather was 

 cloudy a great deal of the time, but the precipitation was nearly normal, 

 there being an excess of only 0.03 inch. The most notable features of the 

 month were the high temperatures, especially over the eastern part of the 

 state, on the forenoon of the 11th, and the sudden and decided fall in tem- 

 perature during the afternoon of that date and the night of the llth-12th. 

 In the eastern part of the state, the morning of the 11th opened clear and 

 warm with sprin:i-likke thundershowers during the forenoon, and the tem- 

 perature up to or above 70° by 1 p. m. About noon in the northeastern 

 and 1 p. m. in the southeastern counties, the wind suddenly shifted from 

 the southwest to the northwest; the temperature Ijegan falling rapidly, and 

 the rain soon changed to snow or sleet, finally developing into a genuine 

 blizzard. The temperature continued to fall during the entire afternoon, 

 and the following night, and at Keokuk it was down to 11° on the morning 

 of the 12th, making a range of 68° in about 18 hours. Between 1.55 p. m. 

 and 2.55 p. m. of the 11th, the temperature fell 37°, and between 12 noon 

 and 12 midnight there was a fall in temperature of 65°. In the north- 

 western counties the temperature was below zero on the morning of the 

 12th, and at many stations it was the lowest ever recorded during the 

 first half of November. In Scott County, the cold wave was immediately 

 preceded by severe local storms; a tornado of moderate intensity appeared 

 about one mile west of Davenport, and moved northeastward about 7 

 miles, causing damage estimated at about $3,000. In the northern part 

 of the state the ground, streams, and pools were frozen on the 12th, and 

 remained so during the rest of the month. In the southern counties, much 

 corn molded in the shock on account of the heavy rains during the latter 

 half of October and the continued damp weather during the early part of 

 November, and the same conditions retarded corn husking. In the northern 

 and western counties, however, the conditions were more favorable for 

 harvesting the crop, and probably 85 per cent to 90 per cent of the corn 

 was in the cribs at the close of the month. Sufficient snow fell over the 

 northeastern counties on the 27-2Sth to make good sleighing during the 

 remainder of the month. 



Temperature. — The monthly mean temperature for the state, as shown 

 by the records of 115 stations, was 29.9°, which is 6.0° 'below the normal 

 for Iowa. By sections the mean temperatures were as follows: Northern 

 section, 26.9°, which is 7.0° below the normal; Central section, 30.2°, 

 which is 5.5° below the normal; Southern section, 32.6°, which is 5.6° 

 below the normal. The highest monthly mean was 36.0°, at Northboro, 

 Page County, and the lowest monthly mean, 24.0°, at Forest City, Winne- 

 bago County, and Sibley, Osceola County. The highest temperature re- 



