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In desiring and construction porcesses of airports and especially, in flight line orientation, the wind plays a major role, the landing and flying path are usually constructed alongside the dominant winds, such that the velocity of lateral winds on flight line would be no more that 13 knote, or 15 miles/ hour, and it should absorb 95 % of the winds including the calm winds.
In this paper wind roses of 16 directions have been drawn using a 17 – year recorded data for Ardebil synoptic station (1984 – 2000) in 8 readings and the software used was WR. PLOT. the aim was to be acquainted with the dominant regional winds on main and succeeding hours. Drawing polar wind roses 16 orients using Autocad software followed this. The frequency percentages of winds blowing in all 16 directions with the inclusioin of 13 knots permitted lateral winds being perpendicular to the flight axis were then located on wind rose. Thereafter, the wind rose was divided by 360 degrees (each having 10 degrees of interval), various extensions of the flight and landing for different seasons were designed. It can be concluded from the study that Flight lines 5-23 and 6-24 could be absorbed 95% of the winds. The Flight lines 5-23 and 6-24 show 70 to 80 degrees rotation toward the right direction from the available flight line.
Keywords: Climatology, Winds, Flight line, Ardebil Airport.