530 IOWA DEPARTMENT OF AGRICULTURE 



JUNE. 



Persistent coolness and a rain and electrical stonn of great severity 

 in the northeasten counties on the night of the 1st, constituted 

 the leading climatological features of June, 1916, in Iowa. There 

 were but few days during the month that were not cooler than 

 usual, and tne mean temperature was lower than in any other June 

 since state-wide otiservations were begun in 1890. No marked warmth 

 occurred until the last two days of the month when in some sections 

 were experienced the highest temperatures since the summer of 1914. 

 The storm already referred to was one of the most destructive of record 

 in northeastern Iowa. Sixteen persons were killed when a pajssenger 

 train ran into a washout, and the monetary losses totaled at least $500,000. 

 of moisture were felt in any section. However, by the close of the month 

 This storm will be described in greater detail in the July report. 



While the month was moderately dry over most of the state, the rains 

 came at such timely intervals that no serious effectis of the deficiency 

 rain was needed in many localities. 



The weather of the month was favorable for most crops except cam; 

 growth of the latter Avas retarded by the cool weather, but the crop 

 made a remarkable response to the warm, humid conditions of the 

 closing days. 



Pressure. — The pressure (reduced to sea level) for the state -was 

 29.87 inches. The highest recorded was 30.25 inches, at Dubuque, on the 

 22d, and the lowest was 29.39, at the same station, on the 8th. The 

 monthly range was 0.86 of an inch. 



Temperature. — The mean temperature for the state, as shown by the 

 records of 110 stations, was 64.5°, or 4.6° lower than the normal. By 

 divisions, three tiqrls of counties to the division, the means were as 

 follows: Northern, 63.2°, or 4.4° lower than normal; Central, 64.7°, or 

 4.6° lower than normal; Southern, 65.7°, or 4.6° lower than the normal. 

 The highest monthly mean was 68.0°, at Thurman, in the extreme south- 

 western part of the state, and the lowest was 61.0°, at Postville, in the 

 extreme northeast. The highest temperature reported was 96°, at Bur- 

 lington, Cedar Rapids, Mount Pleasant and Wihitten, on the 30th, and the 

 lowest was 38°, at Waeihta, on the 18th and 20th, and at Matlock, on 

 the 19th. ■ The temperature range for the state was 58°. 



Humidity. — The average relative humidity for the state at 7 a. m. 

 was 81 per cent, and 7 p. m. it was 62 per cent. The mean for the month 

 was 71 per cent, or 2 per cent higher than the normal. The highest 

 monthly mean was 75 per cent, at Charles City and Keokuk, and the 

 lowest was 67 per cent, at Des Moines. 



Precipitation.- — The average precipitation for the state, as shown by 

 the records of 115 stations, was 3.71 inches, or 0.67 of an inch less 

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

 4.21 inches, or 0.22 of an inch less than the normal; Central, 3.06 inches, 

 or 1.26 inches less than the normal; Southern, 3.85 inches, or 0.54 of an 

 inch less than the normal. The greatest amount, 7.96 inches, occurred 



