TWENTY-FIRST ANNUAL YEAR BOOK— PART VIII 651 



lowed by warmer on the 3d, after which temperatures continued above 

 normal till the first part of the last week. Killing frost or freezing tem- 

 peratures occurred at most stations on the 1st, except along the Mississippi 

 River in the central and southern divisions. On the 29th, killing frost 

 covered these sections also. Not more than 10 per cent of the corn crop 

 was damaged by frost. There was some damage to late truck crops. 

 Unusually favorable conditions during the last two-thirds of September 

 and the greater part of October, matured the greatest corn crop of record 

 in Iowa. During the latter half of October, corn husking made good 

 progress generally but high temperatures in connection with locally 

 heavy rains in the north-central district made it unsafe to crib corn in 

 large quantities in that section. 



The first 10 days were practically rainless and conditions were unusually 

 favorable for farm work and harvesting sugar beets, potatoes, onions, etc. 

 After the 10th precipitation was frequent but the amounts were generally 

 light to moderate and did not hinder farm work materially. Winter wheat 

 made a vigorous growth and pastures improved greatly'. 



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

 30.04 inches. The highest recorded was 30.54 inches at Dubuque and 

 Charles City, on the 5th, and the lowest was 29.54 inches, at Sioux City, on 

 the 13th. The monthly range was 1.00 inch. 



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

 records of 101 stations, was 57.7°, or 6.9° higher than the normal. By 

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

 lows: Northern, 55.9°, or 6.9° higher than the normal; Central, 58.0°, or 

 7.1° higher than the normal; Southern, 59.3°, or 6.7° higher than the 

 normal. The highest monthly mean was 61.6°, at Keokuk, and the lowest 

 was 54.0°, at Northwood. The highest temperature reported was 90°, at 

 Waterloo, on the 11th, and the lowest was 15°, at Decorah, Earlham, Pella, 

 Sigourney and Williamsburg, on the 29th. The temperature range for 

 the State was 75°. 



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

 81 per cent, and at 7 p. m. it was 60 per cent. The mean for the month 

 was 70 per cent, or 2 per cent less than the normal. The highest monthly 

 mean was 81 per cent, at Charles City, and the lowest was 64 per cent, at 

 Omaha, Neb. The lowest observed was 22 per cent, at Davenport, on the 4th. 



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

 record of 106 stations, was 2.13 inches, or 0.33 inch less than the normal. 

 By divisions the averages were as follows: Northern, 2.51 inches or 0.17 

 inch more than the normal; Central, 2.27 inches, or 0.22 inch less than the 

 normal; Southern, 1.62 inches, or 0.92 inch less than the normal. The 

 greatest amount, 4.64 inches, occurred at Charles City, and the least, 0.48 

 inch, occurred at Williamsburg. The greatest amount in 24 consecutive 

 hours, 2.82 inches, occurred at Charles City, on the 14th-15th, 



Snow. Light snow flurries occurred in each division during the last few 

 days of the month, but Dubuque, with 0.1 inch, was the only station that 

 reported more than a trace of snow. 



