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    Descriptive terms of wind speeds

    Beaufort Scale Number
    Description
    Mean wind speed in knots
    Mean wind speed in km/h
    Illustration
    0
    Calm
    <1
    < 2
    F0
    1
    Light
    1-3
    2 - 6
    F1
    2
    4-6
    7 - 12
    F2
    3
    Moderate
    7-10
    13 - 19
    F3
    4
    11-16
    20 - 30
    F4
    5
    Fresh
    17-21
    31 - 40
    F5
    6
    Strong
    22-27
    41 - 51
    F6
    7
    28-33
    52 - 62
    F7
    8
    Gale
    34-40
    63 - 75
    F8
    9
    41-47
    76 - 87
    F9
    10
    Storm
    48-55
    88 - 103
    F10
    11
    56-63
    104 - 117
    F11
    12
    Hurricane
    >=64
    >= 118
    F12
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