552 IOWA DEPARTMENT OF AGRICULTURE 



JUNE 



Temperatures averaged about 5 degrees in excess of the normal in the 

 southwestern and about 1 degree below normal in the northeastern 

 counties. The period 10th-16th was notably warm. On the 16th, many 

 stations reported temperatures of 100 degrees or higher and broke their 

 June records. During the period, 2d-5th, excessive rains occurred from 

 Webster and Hamilton, southeast to Poweshiek and Johnson counties, 

 causing unusual overflows in the watersheds involved. Precipitation was 

 very deficient in several southwestern counties. A severe hailstorm oc- 

 curred in portions of Polk, Marion and Mahaska counties on the 27th. 



Crops made excellent progress, except oats which were prematurely 

 ripened by the hot weather in the southwestern portion of the State; 

 early potatoes also were injured. Corn was far advanced and some laid 

 by at the close of the month. Rye harvest began in the southern counties 

 about the 25th, and oats toward the close of the month. 



Pressure. The mean pressure (reduced to sea level) for the State was 

 29.93 inches. The highest recorded was 30.33 inches, at Sioux City, on 

 the 7th, and the lowest was 29.56 at Sioux City on the 1st. The monthly 

 range was 0.77 inch. 



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

 records of stations, was 70.8°, or 1.7° higher than normal. By divisions, 

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

 Northern, 68.7°, or 1.1° higher than the normal; Central 70.6°, or 1.3° 

 higher than the normal; Southern, 73.1°, or 2.8° higher than the normal. 

 The highest monthly mean was 76.4°, at Thurman, in the extreme south- 

 western part of the State, and the lowest was 65.7° at Postville, in the 

 extreme northeast. The highest, temperature reported was 105° at Omaha, 

 Nebr., on the 16th and the lowest was 38°, at West Bend, on the 2d. The 

 temperature range for the State was 67°. 



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

 77 per cent, and at 7 p. m. it was 60 per cent. The mean for the month 

 was 69 per cent, or normal. The highest monthly mean was 74 per cent, at 

 Charles City, and the lowest was 66 per cent, at Sioux City. 



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

 records of 111 stations, was 5.29 inches, or 0.91 inch more than the normal. 

 By divisions the averages were as follows: Northern, 4.89 inches, or 0.46 

 of an Inch more than the normal; Central, 6.49 inches or 2.17 inches more 

 than the normal; Southern, 4.50 inches, or 0.11 of an inch more than the 

 normal. The greatest amount, 10.19 inches, occurred at Monroe, and the 

 least, 1.55 Inches at Audubon. The greatest amount in 24 consecutive 

 hours, 5.37 Inches, occurred at Monroe, on the 24th. 



Wind. The prevailing direction of the wind was from the southeast. 

 The highest velocity reported from a regular Weather Bureau station was 

 45 miles an hour, from the northeast, at Sioux City, on the 24th. 



