TWENTIETH ANNUAL YEAR BOOK— PART VIII 715 



Shelby counties east-northeast over Polk county, from 12 to 20 inches of 

 snow lay on the ground from the 9th to the 20th. 



Grasses and winter grains were well protected during the severe tem- 

 peratures. Drifting snow delayed transportation by rail and automobile 

 during the first half of the month. During the last week the snow melted 

 rapidly. Live stock were permitted to graze in the cornfields. Corn 

 husking and shelling and fodder shredding were resumed, though shell- 

 ing and marketing were limited by car shortage, the elevators being 

 filled to capacity. 



PRESSURE. 



The mean pressure (reduced to sea level) for the State was 30.22 

 inches. The highest recorded was 30.98 inches, at Keokuk, on the 10th, 

 and the lowest was 29.56 inches at Davenport on the 12th. The monthly 

 range was 1.42 inches. 



TEMPERATURE. 



The mean temperature for the state, as shown by the records of 98 sta- 

 tions, was 15.0, or 8.9° lower than the normal. By divisions, three tiers 

 of counties to the division, the mean temperatures were as follows: 

 Northern, 12.4° or 8.8° lower than the normal; Central, 14.8° or 9.3° 

 lower than the normal; Southern, 17.9°, or 8.5° lower than the normal. 

 The highest monthly mean was 22.3°, at Keokuk, and the lowest monthly 

 mean was 10.1°, at New Hampton. The highest temperature reported was 

 52° at Lamoni, on the 30th, and the lowest temperature reported was 

 -36°, at Thurman, on the 10th, the range for the State being 88°. 



HUMIDITY. 



The average relative humidity for the State at 7 a. m. was 86 per cent, 

 and at 7 p. m. it was 81 per cent. The mean for the month was 84 per 

 cent, or about 3 per cent above normal. The highest monthly mean was 

 90 per cent, at Charles City, and the lowest mean was 82 per cent, at Des 

 Moines. 



PRECIPITATION. 



The average precipitation for the State, as shown by the records of 109 

 stations, was 0.54 inch, or 0.68 inch less than the normal. By divisions, 

 the averages were as follows: Northern, 0.46 inch, or 0.61 inch less than 

 the normal; Central, 0.58 inch, or 0.67 inch less than the normal; South- 

 ern, 0.54 inch, or 0.68 inch less than the normal. The greatest amount, 

 1.55 inches, occurred at Earlham, and the least, 0.08 inch, at Albia. The 

 greatest amount in any 24 consecutive hours, 0.70 inch', occurred at Wav- 

 erly, on the 9th. 



SNOW. 



The average snowfall for the State was 5.8 inches, or 0.4 inch below 

 normal. The greatest amount, 16.0 inches, occurred at Earlham, and the 

 least, 0.5 inch, at Keokuk. 



