12 



TUNISIA 

 TABLE i 



In other words the average annual temperature at the four 

 mountain stations of Ain-Draham, Le Kef, Souk-el-Djemaa, 

 and Feriana is lower than that for the entire province of Tunisia. 

 On the basis of these data the average annual temperature 

 for Tunisia is 18 C. (65.6 F.) ; the average winter temperature 

 i2C. (53.6 F.) and the average summer temperature 23.5 C. 



(74-3 F.). 



Humidity in the Khroumirie Mountains (cork oak) ranges 

 from 85 to 100; during the wet seasons and in summer only 

 is it less than 70. On the central plateau (aleppo pine) it varies 

 from 85 to 70 to as low as 55 in summer. At Tozeur, near the 

 desert to the south, average humidity rarely rises above 70 and 

 in summer is below 55, while evaporation varies from 2013 mm. 

 (78 inches) at Biserta on the sea to 2344 mm. (91 inches) at 

 Tozeur, and 2502 mm. (97 inches) at El Djem. It is in this 

 region that conditions are most unfavorable for tree growth. 



Rainfall. - The rainfall in Tunisia is torrential and irregular. 

 At Ain-Draham in the Khroumirie Mountains, for example, 

 an extreme of 151.4 mm. (5.8 inches) was recorded for one day, 

 and at El-Feidja, a higher elevation still, 167 mm. (6.5 inches) 

 was reported as falling in the 24 hours. 



On the mountains of the north (cork oak) the average yearly 

 rainfall may be from 600 mm. (23 inches) to 1500 mm. (58 

 inches) with 100 to 120 days of rain; in the high plateau and 



