NINETEENTH ANNUAL. YEAR BOOK— PART X 561 



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

 ords of 100 stations, was 55.1°, or 4.3°, higher than the normal. By divi- 

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

 Northern, 52.8°, or 3.8° higher than the normal; Central, 55.5°, or 4.6° 

 higher than the normal; Southern, 57.0°, or 4.4° higher than the normal. 

 The highest monthly mean was 59.0°, at Afton, and the lowest was 50.2° 

 at Northwood. The highest temperature reported was 93°, at Shenandoah, 

 on the 12th; the lowest was 21°, at Sibley, on the 29th. The temperature 

 range for the State was 72°. 



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

 82 per cent, and at 7 p. m. it was 63 per cent. The mean for the month 

 was 72 per cent, or 1 per cent greater than the normal. The highest 

 monthly mean was 78 per cent, at Charles City, and the lowest was 69 

 per cent at Omaha, Nebr. At Des Moines, the remarkably low humidity 

 of 10 per cent was observed at 1:45 P. M. of the 16th. 



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

 records of 110 stations, was 3.64 inches, or 1.18 inches greater than the 

 normal. By divisions the averages were as follows: Northern, 3.34 inches, 

 or 1.00 inch greater than the normal; Central, 3.71 inches, or 1.22 inches 

 greater than the normal; Southern, 3.87 inches, or 1.33 inches greater 

 than the normal. The greatest amount, 7.56 inches, occurred at Thurman, 

 and the least, 1.36 inches, occurred at Mt. Pleasant. The greatest amount 

 In 24 consecutive hours, 3.27 inches, occurred at Boone on the 27th. 



Snoiv. General snow occurred in the northwest portion of the State on 

 the 26th and at its maximum totaled 6 inches over a belt extending from 

 Monona and Woodbury counties to Dickinson and Emmet counties. The 

 snow was soon melted by the heavy rain that followed. 



Wind. The prevailing direction of the wind was south. The highest 

 velocity reported from a regular Weather Bureau station was 37 miles per 

 hour, from the south, at Keokuk, on the 27th. 



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

 of sunshine was 52, or 9 per cent less than the normal. The per cent of 

 the possible amount at the regular Weather Bureau stations was as fol- 

 lows: Charles City, 48; Davenport, 45; Des Moines, 50; Dubuque, 57; Keo- 

 kuk, 61; Sioux City, 53; Omaha, Nebr., 47. 



Miscellaneous Phenomena. Aurora, 8th, 9th, 12th, 16th. Fog, 1st, 2d, 

 9th, 12th. Halos, Solar, 2d, 9th, 17th, 24th. Halos, Lunar, 15th, 16th, 17th, 

 21st, 24th. Rainbow, 8th. Sleet, 25th, 26th, 27th, 30th, 31st. Smoke, 17th. 

 Thunderstorms, 7th, 8th, 27th, 28th. Killing Frosts, Northern Division, 3d, 

 25th, 30th; Central Division, 14th, 25th, 26th, 28th, 31st; Southern Division, 

 28th. 



