79n IOWA DEPARTMENT OF ACrilCULTURE 



CLIMATOLOGY OF THE YEAR 1913. 



The year 1913, as a whole, was the warmest year since 1894, which had 

 (he same mean temperature as the year just closed, and with one excep- 

 tion, 1901, the three summer months gave the highest average temperature 

 lor a like period on record. The months of June, July, August and the 

 first week of September were excessively hot, and the first week of Sep- 

 tember broke all former records for high temperatures for that season of 

 the year. The temperature was above the normal every month of the 

 year, except March, May and October, the greatest excess being in Novem- 

 ber and December. November was the warmest month of that name on 

 record and December almost equalled the record for that month in 1891. 

 The precipitation was less than the normal for the year and for all months 

 except March, April, May and October, when there was a slight excess. 

 The summer months were exceptionally dry in the southern half of the 

 State, and July gave less rainfall than any other month of that name 

 except 1894. The high temperature and the long, severe drought that 

 prevailed during the summer were damaging to the corn, potatoes, pas- 

 turage and the water supply, especially in the southern half of the State, 

 where the effects of the drought were the worst since the summer of 1894. 

 Barometek (reduced to sea level). The average pressure of the atmos- 

 phere for the year 1913 was 30.04 inches. The highest pressure observed 

 was 30.70 inches, at Keokuk, Lee County, on October 31st; the lowest 

 pressure observed was 28.86 inches, at Charles City, Floyd County, on 

 March 14th. The range for the State was 1.84 inches. 



Temperatuee. — The mean temperature for the State was 49.7°, or 2.2" 

 higher than the normal. The highest annual mean was 54.1°, at Keokuk, 

 Lee County. The lowest annual mean was 45.6°, at Estherville, Emmet 

 County, Northwood, Worth County, and Sibley, Osceola County. The 

 highest temperature reported was 108°, at several stations on various dates 

 during the summer. The lowest temperature reported was —25°, at 

 Council Bluffs, Pottawattamie County, and at Thurman, Fremont County, 

 on January 8th. The range for the State was 133°. 



Precipitation. — The average amount of rainfall and melted snow for 

 the year was 29.95 inches, or 2.70 inches less than the normal, and 1.06 

 inches more than the averages in 1912. The greatest amount at any 

 station was 45.18 inches, at Corning, Adams County, and the least amount 

 was 20.31 inches, at Sioux City, Woodbury County. The greatest monthly 

 precipitation was 10.25 inches, at Britt, Hancock County, in May. There 

 was no precipitation at Lake Park, Dickinson County, and at Rock Rapids, 

 Lyon County, in December. The greatest amount in any 24 consecutive 

 hours was 5.25 inches, at Grinnell, Poweshiek County, on June 7th. 



Snowfall. — The average amount of snowfall was 25.4 inches. The great- 

 est amount reported from any station was 49.7 inches at Northwood, Worth 

 County, and the least amount was 10.0 inches, at Britt, Hancock County. 

 The greatest monthly snowfall was 28.0 inches, at Inwood, Lyon County, 

 in April. Measurable precipitation occurred on an average of 86 days. 

 This is 2 more than for 1912. 



