TWENTY-FIRST ANNUAL YEAR BOOK— PART VIII 629 



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

 29.87 inches. The highest recorded was 30.60 inches, at Sioux City and 

 Omaha, Neb., on the 6th; and the lowest was 28.85 inches, the lowest of 

 record for the State for March, at Sioux City, on the 15th. The monthly 

 range was 1.75 inches. 



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

 records of 100 stations, was 38.0°, 4.7° higher than the normal. By di- 

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

 Northern, 34.5°, or 4.0° higher than the normal; Central, 38.6°, or 5.0° 

 higher than the normal; Southern, 41.0°, or 5.1° higher than the normal. 

 The highest monthly mean was 42.8°, at Clarinda, and the lowest monthly 

 mean was 32.0°, at Northwood and Rock Rapids. The highest temperature 

 reported was 80°, at Little Sioux and Onawa, on the 31st. The lowest 

 temperature reported was — 21°, at Inwood on the 5th. The temperature 

 range for the State was 101°. 



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

 79 per cent, and at 7 p. m. it was 65 per cent. The mean for the month 

 was 72 per cent, or about 2 per cent lower than the normal. The highest 

 monthly mean was 80 per cent, at Charles City, and the lowest was 64 

 per cent, at Keokuk. 



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

 the records of 104 stations, was 3.02 inches, or 1.25 inches more than 

 the normal. By divisions the averages were as follows: Northern, 2.81 

 inches, or 1.28 inches more than the normal; Central, 2.79 inches, or 0.92 

 inch more than the normal; Southern, 3.46 inches, or 1.54 inches more 

 than the normal. The greatest amount, 5.70 inches, occurred at Albia, 

 and the least, 0.47 inch, at Omaha, Neb. The greatest amount in any 24 

 consecutive hours, 2.50 inches, occurred at Keosauqua, on the 24th-25th 

 and at Lamoni on the 25th. 



Snow. The average snowfall for the State was 2.4 inches, or 2.9 inches 

 less than the normal. The greatest amount, 16.2 inches, occurred at Rock 

 Rapids. Four stations reported no snow, and 24 stations reported only a 

 trace. 



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 65 miles per hour from the west, the highest of record for 

 the month of March, at Sioux City, on the 16th. 



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

 of sunshine was 60, or about 2 per cent higher than the normal. The per 

 cent of the possible amount at the regular Weather Bureau Stations was 

 as follows: Charles City, 53; Davenport, 60; Des Moines, 64; Dubuque, 

 65; Keokuk, 59; Sioux City, 59; Omaha, Neb., 61. 



Miscellaneous Phenomena. Aurora: 4th, 5th, 22d, 23d. (See page 33.) 

 Birds: (migration of) Bedford, blue birds on the 10th; Boone, robins and 

 blue birds on the 12th, ducks flying north on the 19th; Corydon, robins on 

 the 19th; Earlham, robins on the 1st, blue birds on the 11th, wild geese, 

 ducks and black birds on the 13th, meadow larks on the 20th; Elkader, 

 robins on the 15th; Jefferson, robins on the 8th; Milford, robins and 



