TWENTY-FIRST ANNUAL YEAR BOOK— PART VIII 



645 



Wind. The 'prevailing direction of the wind was from the southwest. 

 The highest velocity reported from a regular Weather Bureau Station was 

 57 miles per hour, from the west, at Sioux City, on the 4th. 



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

 of sunshine was 73, or about 1 per cent below the normal. The per cent 

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

 follows: Charles City, 69; Davenport, 83; Des Moines, 74; Dubuque, 72; 

 Keokuk, 80; Sioux City, 64; Omaha, Neb., 77. 



Miscellaneous Phenomena. Hail, 1st, 2d, 3d, 4th, 7th, 8th, 9th, 12th, ISth, 

 14th, 15th, 16th, 17th, 20th, 22d, 23d. Halos, (lunar or solar) 3d, 4th, 12th. 

 24th, 25th, 29th. Rainbows, 5th, 7th. Thunderstorms, all days except 11th, 

 24th, 26th, 27th, 28th. 



Rivers. Moderately high stages prevailed in the principal rivers, with 

 slight fluctuations during the first half of the month, after which generally 

 falling stages prevailed with the lowest stage on the last day of the month. 

 Rather high stages occurred in the interior rivers during the first half 

 of the month and flood stages occurred at Ottumwa on the 14th, 15th and 

 16th. 



COMPARATIVE DATA FOR THE STATE-^ULY. 



1890. 

 1891. 



1894. 

 1895. 



1897. 



1900- 

 1901. 

 1902. 

 1903. 

 1904- 

 1905. 

 1906. 

 1907. 



1909. 

 1910. 

 1911. 

 1912. 

 1913. 

 1914. 

 1915. 

 1916- 

 1917. 

 1918- 

 1919- 

 1920. 



75.6 

 68.5 

 73.0 

 75.0 

 76.4 

 72.1 

 73.6 

 75.6 

 73.4 

 73.1 

 73.4 

 82.4 

 73.1 

 72.9 

 70.6 

 70.6 

 70.9 

 73.7 

 73.0 

 72.3 

 74.5 

 75.5 

 74.6 

 76.1 

 76.6 

 69.5 

 79.7 

 74.3 

 73.1 

 77.4 

 72.3 



+1.5 110 



—5.6 99 



—1.1 



+0.9 



+2.3 



—2.0 



—0.5 



+1.5 



—0.7 



—1.0 



—0.7 



+8.3 



—1.0 99 



—1.2 lOO 



—3.5 100 



—3.5 |102 



—3.2 



—0.4 



104 

 102 

 109 

 104 

 104 

 106 

 102 

 101 

 102 

 113 



1102 

 102 



1.98 

 4.22 

 5.29 

 3.33 

 0.63 

 3.40 

 6.90 

 3.26 

 2.98 

 3.07 

 6.15 

 2.34 

 8.67 

 4.83 

 4.41 

 2.91 

 3.04 

 7.27 



—1.98 

 +0.26 

 +1.33 

 —0.63 

 —3.33 

 —0.56 

 +2.94 

 —0.70 

 —0.98 

 —0.89 

 +2.19 

 —1.62 

 +4.71 

 +0.87 

 +0.45 

 —1.05 

 —0.92 

 +3.31 

 —0.30 

 +0.81 

 —2.10 

 —1.69 

 —0.25 

 —2.14 

 —1.69 

 +4.36 

 —2.18 

 —1.69 

 —0.79 

 —1.10 

 +0.26 



5.00 

 8.20 



12.86 

 8.84 

 3.50 



10.10 



12.67 

 7.60 



12.88 

 8.66 



18.45 

 5.97 



13.57 



12.72 



11.97 

 7.08 

 7.05 



13.66 

 9.21 



12.20 

 5.69 

 6.62 

 7.56 

 6.23 

 6.50 



15.83 

 6.87 

 6.06 

 8.05 

 7.82 

 7.49 



i 0.37 

 i 1.67 

 1.71 

 1.49 

 T. 

 0.45 

 1.61 

 1.01 

 0.55 

 0.42 

 1.80 

 0.27 

 4.82 

 0.94 

 1.28 

 0.69 

 I 0.26 

 3.97 

 0.70 

 1.20 

 0.12 

 0.08 

 1.17 

 T. 

 0.44 

 3.68 

 0.10 

 0.23 

 0.26 

 0.39 

 1.11 



T. indicates an amount too small to measure, 

 and less than .05 inch snowfall. 



or less than .005 inch rainfall 



