3io 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



vol. go 



MEXICO CITY, D. F., MEXICO 



Lat. 19° 25' 58" N. Long. 99° 8' W. H = 2250 m 



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



GRAV. AT 45° LAT* 



Means of i (7" + 14* + 21"), 105th meridian W. 



500 mm + 



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



M'ns 85.8 85.4 84.7 85.6 85.1 84.9 86.1 86.3 85.1 85.4 86.3 86.0 



f85.5 



TEMPERATURE IN DEGREES C. 

 Means of 7\ 14 h , and 21" 



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



M'ns 13.3 14.9 17.5 18.4 19.0 18.1 17.1 17.3 • 17.0 15.9 14.7 14.2 tl6.4 



TOTAL PRECIPITATION IN MILLIMETERS 



M'ns 



6.5 



6.8 



9.9 15.4 51.8 106.3 127.1 98.3 117.9 43.7 19.4 



* A correction of — 1.2 mm was applied for gravity, 

 t Mean of 12 monthly means. 

 t Sum of 12 monthly means. 



5.8 J6089 



