Here are the ATIS requirements for wind.
WIND [DIRECTION] / [SPEED]
WIND DIRECTION shall be quoted as:
1.SINGLE MEAN DIRECTION; or
2.TWO VALUES representing variation in wind direction whenever:
a.the extremes in wind direction vary by 60 degrees or more; or
b.the variation is considered to be operationally significant (eg the variation is less than 60 degrees, but the variation from the mean results in either a downwind, and / or significant crosswind component on a nominated runway).
(eg "Wind varying between 070 and 120 degrees."); or
3.VARIABLE where it is not possible to report a mean wind direction, such as:
a.in light wind conditions (3 KT or less); or
b.the wind is veering or backing by 180 degrees or more.
(eg Passage of thunderstorm, or localised wind effect).
WIND SPEED shall be quoted as:
1.CALM (less than 1 KT eg "WIND CALM"); or
2.SINGLE MEAN VALUE whenever the extremes between minimum and maximum are 10 KT or less (eg "WIND 250 DEGREES 25 KNOTS); or
3.TWO VALUES REPRESENTING MINIMUM AND MAXIMUM VALUES whenever the extremes in wind speed vary by more than 10 knots (eg "WIND 250 DEGREES MINIMUM 15 KNOTS MAXIMUM 28 KNOTS).
That should clear it up.
