WHOLE VOL. 



NORTH AMERICA 



321 



CHICAGO, UNITED STATES 



Lat. 41° 53' N. Long. 87° 37' W. H b = 823 ft. 



PRESSURE AT STATION LEVEL: COR. TO 0° C. (32° F.) AND TO 



GRAV. AT 45° LAT. 



Means of i(7 h + 19*) corrected to means of 24 hours, 90th meridian W. 



28 inches + 



M'ns 1.203 1.150 1.091 1.091 1.075 1.072 1.116 1.147 1.147 1.157 1.155 1.162 1.130 



TEMPERATURE IN DEGREES F. 

 Means of ^(daily Max. + daily Min.), corrected to 24 hours.* 



TOTAL PRECIPITATION IN INCHES 



Date Jan. Feb. Mar. Apr. May June July Aug-. Sept. Oct. Nov. Dec. Year 



1921 

 1922 

 1923 

 1924 

 1925 



1926 

 1927 

 1928 

 1929 

 1930 



0.97 

 1.16 

 0.92 

 1.32 

 0.68 



1.32 

 1.21 

 0.59 

 3.90 



2.08 



0.38 

 0.74 

 1.05 

 1.68 

 1.62 



3.07 

 0.79 

 1.93 

 0.49 

 1.45 



4.00 

 5.58 

 3.05 

 3.70 

 1.51 



2.56 



2.77 

 1.44 

 5.30 



2.85 



4.47 

 3.70 

 1.38 

 0.84 

 3.15 



2.24 

 6.07 

 2.03 

 4.59 

 2.51 



0.80 

 3.18 

 3.46 

 2.30 

 1.59 



3.06 

 3.96 

 1.62 

 3.41 

 2.94 



1.57 

 0.12 

 1.70 

 6.60 

 4.53 



6.04 

 5.96 

 6.63 

 5.00 

 3.89 



1.87 

 4.00 

 2.67 

 3.66 

 2.47 



4.33 



3.02 

 4.17 

 2.70 



2.80 



4.92 

 1.45 

 7.76 

 8.12 

 2.09 



1.08 

 2.30 

 5.34 

 2.65 

 1.85 



5.72 

 4.37 

 2.50 

 3.14 

 3.19 



6.06 

 5.78 

 2.42 

 2.05 



0.07 



3.26 

 3.40 

 4.56 

 0.84 

 3.72 



1.05 

 1.75 

 2.67 

 3.60 

 2.36 



3.51 

 2.66 

 1.46 



0.86 

 2.57 



4.25 

 4.42 

 4.05 

 1.33 

 2.32 



4.63 

 1.21 

 1.96 



1.90 

 1.21 



0.80 



2.87 

 2.77 

 1.95 

 0.28 



36.10 

 31.57 

 32.47 

 34.96 

 28.33 



35.86 

 41.50 

 35.66 

 37.03 

 26.00 



M'ns 1.41 1.32 3.28 3.10 2.63 4.21 3.23 3.76 3.59 2.72 2.74 1.96 33.95 



* Temperatures in vol 



T!» were also collected to 24 hour means. 



