334 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 105 



TACUBAYA, D. F., MEXICO 



Lat. 19°24' N. Long. 99°6' W. H == 2,309 m. 



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



GRAV. AT. 45° LAT. 



Means of 24 hourly observations, 90th meridian W. 



500 mm. + 



Bate Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Mean 



1931 

 1932 

 1933 

 1934 

 1935 



1936 

 1937 

 1938 

 1939 

 1940 



81.3 



81.6 

 81.3 

 81.7 

 81.9 



80.6 

 80.8 

 81.4 

 81.3 

 81.1 



80.4 

 81.1 



81.5 

 82. '2 

 81.4 



80.1 

 81.3 

 81.9 

 80.5 

 80.4 



80.4 

 80.2 

 80.8 

 81.5 

 80.9 



79.9 

 80.3 

 80.9 

 81.1 

 79.8 



80.8 

 80.3 

 80.7 

 81.2 

 80.4 



81.0 

 80.7 

 80.7 

 80.9 

 80.5 



80.9 

 81.3 

 80.6 

 81.0 

 80.6 



80.4 

 80.6 

 80.5 

 80.5 

 81.2 



81.7 

 80.2 

 81. C 

 80.6 

 80.6 



80.4 

 81.3 

 81.3 

 80.6 

 80.8 



80.7 

 81.9 

 81.3 

 82.0 

 81.9 



81.0 

 81.9 

 81.8 

 82.0 

 82.5 



82.6 

 81.1 

 80.9 

 82.4 

 81.3 



81.2 

 81.9 

 81.7 

 81.4 

 81.8 



81.4 

 81.4 

 80.0 



81.2 

 80.9 



80.9 

 81.5 

 81.3 

 81.3 

 81.3 



82.1 

 81.4 

 81.8 

 82.2 

 82.0 



81.8 

 81.5 

 81.7 

 81.6 

 81.7 



81.5 

 82.5 

 82.9 

 81.8 

 82.0 



81.5 

 81.6 

 81.7 

 83.4 

 81.7 



81.3 

 81.6 

 82.8 

 82.4 

 81.4 



81.7 

 81.2 

 81.6 

 81.5 

 81.0 



Mean 81.3 81.1 80.6 80.7 80.8 80.9 81.7 81.6 81.1 81.8 82.1 81.7 



81.3 

 81.2 

 81.4 

 81.7 

 81.3 



80.9 

 81.2 

 81.4 

 81.3 

 81.2 



81.3 



TEMPERATURE IN DEGREES C. 

 Means of 24 hourly observations 



TOTAL PRECIPITATION IN MILLIMETERS 



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



1931 

 1932 

 1933 

 1934 

 1935 



1936 

 1937 

 1938 

 1939 

 1940 



3.4 

 T 

 0.0 

 7.6 

 6.2 



12.9 



T 



0.0 



0.2 



20.0 



T 

 12.0 



6.0 

 13.8 



1.1 



0.2 



11.4 



14.6 



T 



2.5 



0.8 

 1.0 

 4.6 

 4.4 

 10.7 



1.0 

 36.9 

 10.8 



4.7 



47.4 



16.0 

 6.0 

 3.9 



32.9 

 3.2 



16.0 



23.8 



23.9 



72.5 



4.4 



80.0 

 42.0 

 17.8 

 54.9 

 92.2 



103.0 



101.9 



22.3 



27.4 



82.0 



136.1 

 02.2 

 41.2 

 69.3 



207.2 



46.9 

 159.6 

 118.5 



87.8 

 142.1 



169.6 

 237.0 

 153.9 

 88.9 

 175.1 



215.6 

 194.5 

 157.1 

 183.9 

 177.8 



220.1 

 154.7 

 266.0 

 251.9 

 100.0 



134.3 

 169.5 

 218.0 

 149.2 

 129.9 



161.7 

 127.0 

 99.6 

 168.6 

 126.2 



108.5 



105.5 



159.5 



95.4 



14.2 



21.4 

 119.8 

 49.7 

 19.4 

 38.1 



53.6 

 47.6 

 15.7 

 117.6 

 15.8 



Mean 6.0 



6.2 12.2 20.3 62.4 107.1 175.3 179.4 116.6 49.9 



T 



0.0 



25.2 



3.0 



3.5 



9.5 

 1.8 

 11.2 

 0.0 

 0.5 



5.5 



19.2 



T 



10.7 



21.8 

 0.2 



2.5 

 3.7 

 8.5 

 0.6 

 9.8 



828.9 

 761.7 

 678.6 

 736.5 

 763.7 



703.9 

 856.2 

 760.1 

 739.7 

 646.4 



7.7 747.6 



