Methodology
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3.1.3. Wind
Wind is one of the most important determinants of rainfall, evaporation and consequently
climate. According to data from the Souk-Ahras state meteorological station, the prevailing
winds in the Taoura region are from north to south (Table 12).
They are most active during the rainy season. In summer, these winds blow in the form of the
sirocco. They are dry, hot and often quite strong, favoring evaporation. (Davide, 1956).
Table 12: Average monthly wind speed (2003 -2018).
Month
S
O
N
D
J
F
M
A
M
J
J
A
Annual
average
Wind
speed
(m/s)
2,8
2,5
3,3
3,4
3,5
3,8
3,6
3,7
2,9
3,1
3,1
2,9
3,2
Source : The weather station of the state of Souk-Ahras.
Figure 20: Average monthly wind speed (2003 -2018).
According to Table 12, and the histogram (Figure 20), the average annual wind speed is 3.2
m/s. The minimum monthly mean wind speed is 2.5 m/s (October), the maximum monthly
mean is 3.7 m/s (April).
3.1.4. Humidity
The relative humidity of air is the ratio of the actual vapor pressure by the saturation vapor
pressure at the same temperature. It gives us an idea of whether the atmosphere is close to
condensation or not.