SEVENTEENTH ANNUAL YEAR BOOK— PART X 



529 



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

 The highest velocity reported from a regular Weather Bureau station was 

 49 miles an hour from the no'rthwest, at Sioux City, on the 10th. 



Sunshine and Clovdiness. — The average per cent of the possible 

 amount of sunshine was 62, or about 2 per cent more than normal. The 

 per cent of the possible amount at the regular Weather Bureau stations 

 was as follows: Charles City, 56; Davenport, 66; Des Moines, 67; 

 Dubuque, 55; Keokuk, 63; Sioux City, 65; Omaha, Nebr., 62. 



Miscellaneous Phenomena. — Dates of: Hail, 3d, 6th, 7th, 14th, 15th, 

 16th, 17th, 20th, 21st, 22d, 24th, 25th, 26th, 27th; Sleet, 15th, 16th; Thun- 

 der, all except the 4th and 30th. 



Rivers. — At Clinton, Iowa, the Mississippi reached a stage o'f 18.0 feet, 

 on May 5th; at Le Claire, Iowa, 12.1 feet, on ]\Iay 5t'h; at Davenport,' 

 15.9 feet, on May 5th and 6th, and at Muscatine, Iowa, 17.7 feet, on May 

 7th and 8th, which were the highest stages since the year 1892. On May 

 4th, a break in the levee protecting Muisicatine Island, occurred about 

 7 miles below the city of Muscatine. Two other breaks occurred in the 

 same levee before the crest of the flood was reached, and 37,000 acres 

 of valuable land were flooded in Iowa, below Muscatine, causing an esti- 

 mated loss to prospective crops on that area of about $10.00 an acre. 



In the Dubuque river district the losses during the April-May floods 

 v.ere estimated at $225,000. 



COJVIPABATIVE DATA TOB THE STATE— MAT. 



Temperature 



Precipitation 



Number of 

 Days 



o ^ 



1900 — 



1901 ... 



1902 — 



1904 

 1905 

 1906 

 1907 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



1916 



60.7 

 63.8 

 61.6 

 50.6 

 58.3 

 60.8 

 53.5 

 C9.4 

 57.9 

 65.4 

 64.9 

 62.7 

 59.4 

 62.2 

 56.1 

 69.9 



— 2.8 

 -2.2 



— 6.5 



— 3.9 

 + 0.6 

 -f 1.2 

 + 5.0 



— 2.0 



— 0.9 



— 0.3 

 -t- 2.7 

 + 0.2 

 -I- 3.3 

 -t- 1.1 



— 0.9 



— 2.2 

 + 0.3 



— 7.0 



— 1.1 



— 2.6 



— 5.1 

 + 4.4 

 -f 2.2 



— 1.1 

 -f 1.7 



— 4.4 



— 0.6 



—1.01 

 -1.39 

 -h4.20 

 —1.12 

 —2.70 

 -1.38 

 -t-2.12 

 —2.65 

 +0.10 

 +1.66 

 —1.26 

 —2.22 

 + 0.82 

 +3.98 

 —0.79 



-1.09 

 +3.77 

 —0.23 

 -1.16 

 —0.81 

 -1.24 

 -1.67 

 -1.26 

 +2.77 

 +0.36 



6.44 

 7.10 

 12.64 



4!77 

 5.79 

 11.79 

 3.59 



7.82 

 11.47 



4!57 

 18.04 

 15.45 



8.15 

 10.83 

 10.72 



14!33 

 7.85 

 6.91 

 8.73 

 6.41 



10.25 

 6.90 



13.21 



10.44 



1.61 

 1.46 

 4.87 

 1.65 

 0.33 

 0.84 

 3.40 

 0.21 

 2.22 



o!96 

 0.72 

 0.87 

 2.88 

 1.50 

 2.57 



o!71 

 1.33 

 1.86 

 1.29 

 0.42 

 0.72 

 3.14 

 0.30 



2.14 



12 



10 15 



9 16 



10 14 



13 11 

 10 14 



14 9 

 12 13 



T indicates an amount too small t> measure, or less than .005 Inch of pre^ 

 ipltation, and less than .05 Inch of snowfall. 



