WHOLE VOL. 



NORTH AMERICA 



311 



MONTERREY, MEXICO 



Lat. 25° 40' N. Long. 100° 18' W. H = 528 m 



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



GRAV. AT 45° LAT* 



Means of £(7 h + 14" + 21 h ), 90th meridian W. 



700 mm + 



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



M'ns 18.3 16.7 15.0 13.8 13 3 13.6 15.3 15.2 14.8 15.9 18.0 18 2 15.7 



TEMPERATURE IN DEGREES C. 

 Means of 7 h , 14 h , and 21 h 



M'ns 13.9 16.9 19.7 23.5 25.7 27.0 27.3 28.3 25.5 22.1 17.4 13.8 



21.8 



TOTAL PRECIPITATION IN MILLIMETERS 



M'ns 12.2 25.5 16.1 30.9 40.9 103.7 60.3 36.4 164.9 115.6 



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



28.2 22.0 656.7 



