90 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 90 



HELWAN, EGYPT 



Lat. 29° 52' N. Long. 31° 20' E. H b 

 PRESSURE AT STATION LEVEL: COR. TO O c 

 GRAV. AT 45° LAT. 

 Means of 24 hours 

 700 mm + 



= 115.6 m 

 C. (32° F.) AND TO 



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



TEMPERATURE IN DEGREES C. 

 Means of i(8 h + 14" + 20 h + Min.) corrected to means of 24 hours 



M'ns 13.1 14.0 17.1 21.5 25.4 27.7 28 2 28.2 26.3 23.7 19.9 15.1 



TOTAL PRECIPITATION IN MILLIMETERS. h r = 1.0 m 



21.7 



