DATES OF EGYPT AND THE SUDAN. 5 
in the desert zone rather than among maritime stations. The evi- 
dences of this in the record of 38 years at Abbasia, a military post in 
the unirrigated uplands in the northeast suburbs of Cairo, and in 
incomplete records at Ismailia on the Suez Canal are discussed in 
subsequent pages. 
Table I gives the meteorological data for all the stations at which 
weather records are available in the three great climatic zones, with 
the characteristic date varieties for each type of climate. 
DESERT TROPICAL 
MONTHS 
WIDLA GAY 
IMOSFW 
LSTKH 10M 
WAN UAP 
ELRUARY 
LAR CHL 
APAYL 
MAY 
(UNE 
WSULY 
AUGUST 
SEPTEMIBE RRA 
Fie. 1.—Diagrams showing the mean monthly relative humidity (in percentage of saturation, dark bars) 
and the mean monthly temperature (in °F., shaded bars) for 12 stations in Egypt and the Sudan. 
Figure 1 shows the mean monthly relative humidity (in percentage 
of saturation) by the use of dark-faced bars and the mean-monthly 
temperatures (in degrees Fahrenheit) by the use of tint-lined bars 
immediately below, in diagrammatic form, for twelve stations in 
Egypt and the Sudan. 
Figure 2 shows by curves the mean monthly temperature (in degrees 
Fahrenheit) and the relation of the monthly mean to the assumed 
“zero point” (64.4° F.) of the date in flowering for the twelve weather- 
observing stations listed in Table I. 
