http://wgbis.ces.iisc.ernet.in/biodiver ... e.htm#wind
Wind
In the western Ghats wind pays a major role in governing the climate as it determines the alteration of seasons. In summer they bring large masses of water, the condensation of which cause the monsoon rains. They are also responsible for the drying up and cooling of the peninsula in winter.
During the dry season (Dec to March), the dominant winds are from north -east /or east corresponding to the dry trade winds which blow over India by pushing back the inter-tropical front of convergence. These winds commence from November itself. Their main direction varies according to the stations. They are essentially from the east Belgaum, Hassan, Plaghat and Kozhikode. The NE winds are also frequent in Gadag, Shimoga, Mysore and Coimbatore and are dominant in Ootacamund and Agumbe.
In autumn, the direction is reversed once again and the winds are from northeast and east. This phenomenon is quite clear in Ootacamund and Agumbe from month corresponds more to a transitional period similar to the situation in March or April. However, from November onwards, the winds from the east and or north -east dominate everywhere.
Wind Velocity
The winds are never very violent in these regions. During the period of 10 years that have been taken into consideration, the frequency of speed exceeding 61 Km/h is nil. Even velocities of 20 -61 km/h are exceptional: their frequency does not exceed 10% except during the monsoon months (June -July - August) in some stations situated towards the interior such as Coimbatore, Mysore, Gadag where, however they do not exceed 30 %.
In the coastal stations it is slightly different, as the most violent winds blow in the afternoon in April, May, rather than in June-July. The average values are generally between 3.8 Km/h (Shimoga) and 8.8 Km/h (Mysore). The speed is a little higher (between 10 and 11 km/h) near the Palghat Gap (the only discontinuity in the Ghats) where the wind blows more violently between the Palni and Nilgiri horsts (Kozhikode, Palghat, and Coimbatore). The afternoon winds are stronger than the morning winds near the coast, as well as in the interior of the plateau.
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