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The relative humidity of Nigeria is generally high with readings above 80
percent during the wet season (Table 4.1). During the dry season the relative
humidity decreases to approximately 75 percent which is brought about by the
dry Tropical Continent air mass (NIPP, 2010).
4.3.3 Wind Patterns
Wind patterns are determined by the ITD zone, with westerly and southwardly
winds prevalent during the wet season, and north-easterly winds during the
dry season (NIPP, 2010). Meteorological data from the Bohicon meteorological
station (the closest inland meteorological station for which complete yearly data
is available) for 1989, 1990, 1994, 1997 and 1998. The use of meteorological from
a site some 400 km distant is recognised as a limitation in the assessment, as s
discussed further in Chapter 7. However, in the absence of a station closer to the
site that monitors all the relevant parameters the use of this data is deemed
necessary.
The meteorological data indicates that south-westerly winds are prevalent
within the area (USEPA AERMET program). In the recent years the maximum
sustained wind speed has reached 44 km/h, equivalent to approximately 28
m/h (Weather2, 2011). The wind roses produced from the data are shown in
Figure 4.2.
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