SEVENTEENTH ANNUAL YEAR BOOK— PART X 



527 



COMPARATIVE DATA FOR THE STATE— APRIL. 



Temperature 



Precipitation 



Number of 

 Days 



^« 



1900 

 1901 

 1902 

 1903 

 1904 

 1905 

 1906 

 1907 

 1908 

 1909 

 1910 

 1911 

 1912 

 1913 

 1914 

 1915 

 1916 



51.8 

 50.6 

 45.4 

 45.5 

 51.7 

 54.2 

 54.5 

 47.9 

 48.1 

 48.9 



49!9 



48.2 

 49.8 

 44.1 

 47.5 



4l!5 

 50.5 

 43.8 

 52.5 

 46.7 

 49.9 

 50.2 

 48.6 

 57.2 

 47.1 



+3.1 

 +1.9 

 —3.3 

 —3.2 

 +3.0 

 +5.5 

 +5.8 

 —0.8 

 —0.6 

 +0.2 

 +3.5 

 +1.2 

 —0.5 

 +1.1 

 —4.6 

 —1.2 

 +3.8 

 —7.2 

 +1.8 

 —4.9 

 +3.8 

 —2.0 

 +1.2 

 +1.5 

 —0.1 

 +8.5 

 —1.6 



2 1.80 



2.15 

 14 4.75 



4.21 

 3.07 

 2.62 

 5.02 

 5.35 

 2.56 

 2.40 

 2.67 

 1.79 

 1.71 



17 i 2.£ 

 13 3.e 

 10 

 22 

 10 

 8 

 14 

 15 



2.42 

 1.32 

 2.24 

 4.58 

 1.48 

 3.09 



3!28 

 2.52 

 1.41 

 2.62 



—1.06 

 —0.71 



+l!35 

 +0.21 

 -0.24 

 +2.16 

 +2.49 

 -0.30 

 -0.46 

 —0.21 

 —1.07 

 —1.15 

 +0.12 

 +0.77 

 +0.17 

 —0.44 

 —1.54 

 —0.62 

 +1.72 

 —1.38 

 +0.23 

 —0.20 

 +0.42 

 —0.34 

 —1.45 

 —0.24 



T indicates an amount too small to measure, or less than .005 inch rainfall, 

 and less than .05 inch snowfall. 



MAY. 



Over most of the state the month was a rather typical May. The tem- 

 perature averaged within half a degree of the normal, the precipitation 

 exceeded but slightly the average of past Mays, while both the amount 

 of sunshine and the wind movement corresponded closely to the usual 

 values. The most striking feature of the month was the abnormally 

 heavy precipitation in the extreme southern part of the state. Over a 

 considerable area the amounts were in excess of 7 inches, and in parts 

 of Des Moines, Lee and Van Buren counties more than 9 inches occurred. 



No uncommon features were associated with the temperature condi- 

 tions of the month. In almost all parts of the state the weather was 

 slightly cooler than usual, but the average daily deficiency of temperature 

 amounted to only a fraction of a degree. Moreover, the monthly extremes, 

 of temperature, both high and low, were well within the limits estab- 

 lished in past years. Most of the monthly minimum temperatures at 

 the individual stations occurred either on the 2d or 18th, the readings 

 ranging from 2'*' to 38°. The warmest weather was experienced as a 

 rule on the 6th, 7th and 25th, when the maximum temperatures ranged 

 from 83° to 94°. Froist at somewhat damaging character formed on the 



